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    FAQ/Walkthrough by RainingMetal

    Version: 1.02 | Updated: 08/26/09 | Printable Version | Search Guide | Bookmark Guide

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    Half-Life Guide
    For PC
    By Raining Metal (Boocatcher5@hotmail.com)
    Version 1.03
    >Table of Contents<
    1.0 Introduction
    1.1 Version History
    1.2 Story
    2.0 Basics
    2.1 Controls
    2.2 Hazard Course
    2.3 Puzzles
    2.4 High-Definition Pack
    3.0 In-Game
    3.1 Weapons
    3.2 Items
    3.3 Allies
    3.4 Enemies
    4.0 Walkthrough
    4.11 Black Mesa Inbound
    4.12 Anomalous Materials
    4.13 Unforeseen Consequences
    4.14 Office Complex
    4.15 We've got Hostiles
    4.16 Blast Pit
    4.17 Power Up
    4.18 On a Rail
    4.19 Apprehension
    4.20 Residue Processing
    4.21 Questionable Ethics
    4.22 Surface Tension
    4.23 Forget About Freeman!
    4.24 Lambda Core
    4.25 Xen
    4.26 Gonarch's Lair
    4.27 Interloper
    4.28 Nililanth
    4.39 Conclusion
    5.0 Other
    5.1 Cheats
    5.2 G-man Sightings
    5.3 Mod List
    5.4 FAQ
    5.5 Email Guide
    6.0 And The Rest!
    6.1 Website List
    6.2 Credits
    6.3 Legal Disclaimer
    To search for the section wanted in this Guide, Highlight the Number beside the
    subject (Such as 3.3) and press Ctrl + C, then F, and then V. This activate a
    finding system to look for the text put in (in this case, a number with a
    decimal) and simply click “Next”.
    1.0 >Introduction<
    Greeting Readers! Raining Metal is good to go! Valve, the makers of this game,
    are known for their revolutionary graphics and AI in their games. Even though
    this game is years old, it's still fun. So wake up Mr. Freeman. Black Mesa is
    1.1 >Version History<
    Version 1.03
    Made a minor overhaul for spelling corrections.
    Version 1.02
    Added a note by Aaron “clarince63” Reis.
    Version 1.01
    Added a note by Donald "Dch48 nick" Henderson.
    Version 1.00
    I finally completed the rest of the walkthrough (it was quite a hellish
    experience having to go through the trash hole Xen).
    Version 0.91
    Finished the walkthrough for Xen.
    Version 0.90
    I need some more FAQs in this guide along with some walkthroughs in Xen,
    Gonarch's Lair, Interloper, and Nihilanth.
    1.2 >Story<
    Note that this section has spoilers. Skip this part to avoid them.
    Gordon Freeman is a lowly scientist at Black Mesa. Lately, the pieces of
    equipment have been acting strangely, and Dr. Freeman is half an hour late!
    Also, a mysterious man with a briefcase was watching him with interest.
    After getting hold of an H.E.V suit, he steps into a test chamber, but things
    go wrong and Aliens from a borderworld invade Black Mesa! Dr. Eli Vance,
    another scientist, sends Freeman towards the surface. After travelling through
    the labs and canals and reaches the office complex, he gets information that
    Soldiers are coming to Black Mesa. However, he finds out that the Soldiers were
    not at all rescuing the members of Black Mesa, in fact, they were sent to clear
    the place of any aliens and witnesses! Freeman finds out that he's the primary
    target of the marines. He also gets information to get to the Lamda Reactor as
    soon as he can. The only way to get there however, is through the rocket silos,
    to some old train rails. After Freeman slays some Tentacle creatures, he
    manages to reach the rails. A security guard tells him to launch a rocket in
    order to contact the Lambda team. He manages to do so, shooting his way through
    the aliens and the marines, but later, he gets captured by the military, and
    needs to get through the waste plant, through some labs, and out into hostile
    territory to get to the Lambda reactor. Nearing towards his goal, the marines
    start to pull out due to heavy casualties.
    Freeman reaches the Lambda building, but the area was under attack by hordes of
    aliens! He reaches the teleportation area, where he meets Dr. Kliener and a
    security guard. Dr. Kliener explains that Freeman must get to the borderworld;
    Xen, and destroy what is responsible for the disaster. Freeman manages to
    teleport to Xen, and defeats a Gonarch and confronts the leader of Xen,
    Nililanth. Freeman kills the alien, and meets the mysterious briefcase-carrying
    man in blue. The man in blue, interested in Freeman, offers him to join his
    cause, or to leave him on Xen forever. Freeman joins him without hesitation,
    and the story continues...
    2.0 >Basics<
    This section teaches the player how to play Half-Life.
    2.1 >Controls<
    These are the default controls of Half-Life. Note that the player can change
    the control setup via the options menu.
    Mouse: Look around.
    W: Move Forward.
    A: Move Left.
    S: Move Backward.
    D: Move Right.
    Primary Mouse Button: Primary Fire.
    Secondary Mouse Button: Secondary Fire.
    Space Bar: Jump.
    Ctrl: Crouch (Hold).
    E: Action.
    F: Use Flashlight.
    Q: Switch to last-used Weapon.
    R: Reload.
    Shift: Walk.
    1-5: Weapons.
    Esc: Pause menu.
    2.2 >Hazard Course<
    The Hazard course can teach Gordon how to swim, shoot, use objects, interact
    with people, solve many puzzles, and much, much more! I highly recommend
    players new to this game to go to the hazard course before starting the game.
    Area 1: Moving and Jumping.
    This area teaches H.E.V users to jump. Through pipes to long gaps, this
    exercise will be an important method to learn. This area also teaches users
    how to climb ladders and how to use a long-jump module.
    Area 2: Using the Environment.
    This sector teaches users how to use things around the facility, such as
    elevators, first aid stations, wheels, boxes, and more! This also tests players
    how to use the crowbar and the flashlight.
    Area 3: Combat & Swim.
    This target range gives players how to fire weapons and use the secondary
    triggers. Also, this area contains a pool which the players will need to swim
    across to the next area.
    Area 4: Defence capabilities.
    The area here represents hazards that the player will likely encounter in the
    game. Also, it teaches players how to use H.E.V charging stations.
    Area 5: Interacting with civilization.
    The final place requires the player to use a security guard to open up a door.
    To finish the course, the player must drive a train to the exit.
    2.3 >Puzzles<
    Half-Life contains many puzzles. Some are hard. To get past them, read signs
    and try to find out how they're connected to the problem. Some objects might be
    needed for the puzzles.
    2.4 >High Definition Pack<
    To install the High-Definition Pack, go to Steampowered.com, go to the support
    section, and type in "High-Definition Pack". Select the first option, then
    click on the link above.
    3.0 >In-Game<
    Here's the information about the story mode.
    3.1 >Weapons<
    Here's what Gordon needs to fight against the enemies he encounters.
    Console Name: crowbar.
    Clip Size: N/A.
    Carrying Capacity: N/A.
    Power: Average.
    Accuracy: Very High.
    Rate of Fire: Fast.
    Range: Melee.
    Ammo Type: N/A.
    Alternate Fire: None.
    This is the first weapon Gordon gets. It's useful for breaking boxes and such.
    *Glock 9mm*
    Console Name: 9mmhandgun.
    Clip Size: 17.
    Carrying Capacity: 250.
    Power: Average.
    Accuracy: High/Low.
    Rate of Fire: Semi-automatic.
    Range: Long/Short.
    Ammo Type: 9mm.
    Alternate Fire: Fast firing.
    This is the first gun Gordon gets. It's effective against aliens and for
    long ranges.
    *.357 Revolver*
    Console Name: 357.
    Clip Size: 6.
    Carrying Capacity: 36.
    Power: High.
    Accuracy: High.
    Rate of Fire: Bolt.
    Range: Long.
    Ammo Type: .357.
    Alternate Fire: Scope (Multi-player only).
    The 357 is one of the more useful guns in Half-Life, but its ammunition is less
    plentiful around Black Mesa. Getting direct hits with this revolver can be
    deadly against all targets.
    Console Name: mp5/9mmAR.
    Clip Size: 50.
    Carrying Capacity: 250.
    Power: Average, Explosive.
    Accuracy: Average.
    Rate of Fire: Automatic.
    Range: Short.
    Ammo Type: 9mm, Launcher Grenades.
    Alternate Fire: Fire Grenade.
    A very versatile weapon, but a bizarre one too. Its grenade launcher is made
    up for its low accuracy. But it has the most plentiful ammunition around.
    *SPAS-12 Gauge*
    Console Name: shotgun.
    Clip Size: 8.
    Carrying Capacity: 125.
    Power: High.
    Accuracy: Medium.
    Rate of Fire: Pump.
    Range: Very Short.
    Ammo Type: Shotgun Shell.
    Alternate Fire: Double Shot.
    This is one of the stronger weapons. At close range, this weapon is very
    deadly. It is useful in tight areas. Its shells must be reloaded individually.
    Console Name: crossbow.
    Clip Size: 5.
    Carrying Capacity: 50.
    Power: Very High, Explosive (Multi-Player Only).
    Accuracy: Very High.
    Rate of Fire: Bolt.
    Range: Very Long.
    Ammo Type: Arrows.
    Alternate Fire: Scope.
    Despite its lame fact that it replaces a sniper rifle, this is one of the most
    deadly weapons in the game! Its main disadvantages is that its rate of fire and
    reload times is VERY slow, and that its shots aren't instantaneous.
    *Rocket Launcher*
    Console Name: rpg.
    Clip Size: 1.
    Carrying Capacity: 5.
    Power: Explosive.
    Accuracy: High.
    Rate of Fire: Single.
    Range: Long.
    Ammo Type: Rockets.
    Alternate Fire: Laser guidance.
    This is the main anti-air weapon. Good for taking down aircraft and armored
    foes, as well as grouped targets.
    *Tau Cannon*
    Console Name: gauss.
    Clip Size: N/A.
    Carrying Capacity: 100.
    Power: High.
    Accuracy: Very High.
    Rate of Fire: Semi-automatic.
    Range: Any.
    Ammo Type: Cell.
    Alternate Fire: Charge Up.
    The experimental weapon is a good weapon for taking down the tougher targets.
    It has unmatched accuracy, so it's a good weapon for taking down tough targets
    at long ranges.
    *Gluon Gun*
    Console Name: egon.
    Clip Size: N/A.
    Carrying Capacity: 100.
    Power: VERY High!
    Accuracy: Very High.
    Rate of Fire: Automatic.
    Range: Any.
    Ammo Type: Cell.
    Alternate Fire: Heatseaking (Multi-player Only).
    This is the premier weapon in Half-Life. The only lay-off in its status is that
    it consumes its ammunition too quickly! Otherwise, this will take down even the
    toughest targets!
    Console Name: hornetgun.
    Clip Size: N/A.
    Carrying Capacity: 8.
    Power: Medium.
    Accuracy: Very High.
    Rate of Fire: Semi-Automatic.
    Range: Long.
    Ammo Type: Hornets.
    Alternate Fire: Fire Fast.
    This is one of the more useless weapons. I would only use this if Gordon is low
    on ammunition (which is highly unlikely). Its ammo replenishes automatically.
    Console Name: handgrenade.
    Clip Size: N/A.
    Carrying Capacity: 10.
    Power: Explosive.
    Accuracy: Low.
    Rate of Fire: Throw.
    Range: Short.
    Ammo Type: Hand Grenades.
    Alternate Fire: None.
    I rarely use these. For the best results, throw them to a lower level.
    *Satchel Charges*
    Console Name: satchel.
    Clip Size: N/A.
    Carrying Capacity: 5.
    Power: Explosive.
    Accuracy: N/A.
    Rate of Fire: Throw.
    Range: N/A.
    Ammo Type: Detpacks.
    Alternate Fire: Detonate.
    These go perfectly well with certain environments. Plan ahead and these will be
    fun to use.
    Console Name: tripbomb.
    Clip Size: N/A.
    Carrying Capacity: 5.
    Power: Explosive.
    Accuracy: N/A.
    Rate of Fire: Deploy.
    Range: N/A.
    Ammo Type: Tripbombs.
    Alternate Fire: None.
    I hardly use Tripmines. The only good they will ever be is to be placed next
    to Satchel Charges for extra explosions, or as staircases on walls (yes, Gordon
    CAN step on Tripmines).
    Console Name: snarks.
    Clip Size: N/A.
    Carrying Capacity: 15.
    Power: High, Explosive.
    Accuracy: N/A.
    Rate of Fire: Deploy.
    Range: N/A.
    Ammo Type: Snarks.
    Alternate Fire: None.
    Heh, heh. These adorable creatures are good for arena-like areas. They will
    refuse to attack other aliens however, and should be used on military-only
    sectors. If they don't find any other targets, they might attack the user!
    3.2 >Items<
    These are the items Freeman is likely to encounter during his journey. He
    cannot carry them, he can only use them.
    *Health Pack*
    Console Name: healthkit.
    Purpose: Gives Gordon health.
    Health packs can save Gordon's life! Pick them up to restore Health.
    *Soda Can*
    Console Name: can.
    Purpose: Gives Gordon 1 unit of health.
    Soda Cans always come out of those vending machines. They won't do much for
    Gordon, but every little bit helps.
    *Energy Battery*
    Console Name: battery.
    Purpose: Gives Gordon armor.
    This is like the Health Pack, only with Gordon's armor. Armor is essential to
    Gordon's survival, as it can absorb the majority of the damage Gordon takes.
    *H.E.V Suit*
    Console Name: suit.
    Purpose: Everything.
    This starts the whole game. Without it, Gordon would be dead.
    *Long Jump Module*
    Console Name: longjump.
    Purpose: Allows Gordon to Long Jump.
    An important item for Xen. Gordon can jump to long distances with this item.
    *First Aid Station*
    Console Name: N/A.
    Purpose: Replenishes Gordon's Health.
    The First Aid Station can be used more than once, but only has a certain amount
    of health to replenish (depending on difficulty). Once the light goes out, the
    Station cannot be reused.
    *H.E.V Charging Station*
    Console Name: N/A.
    Purpose: Replenishes Gordon's Armor.
    Like the First Aid Station, but replenishes armor instead. Once the station
    goes offline, it cannot be reused.
    Console Name: N/A.
    Purpose: Weapon.
    Found mainly at Military zones, Freeman can use their weapons against them and
    the aliens. There are more convenient ways to use the many turrets though, such
    as breaking down walls and doors.
    *Healing Pool*
    Console Name: N/A.
    Purpose: Replenishes Gordon's Health.
    Found only in Xen, these won't heal as fast as the first-aid stations, but have
    an infinite supply of wound-fixing. There are also some stations on walls,
    which act similar to the pools.
    *Jump Pad*
    Console Name: N/A.
    Purpose: Gives Gordon a high jump.
    Found in infested areas of Black Mesa, Gordon might need these to get to
    certain spots.
    3.3 >Allies<
    These are the few allies Gordon will get help from. Some of them will need to
    survive in order to do their task.
    Weapon: None.
    Health: Low.
    Speed: Medium.
    Special Abilities: Healing, High Security Clearance.
    These lowly fellows are mainly the civilians of the game. However, they can be
    allies when Gordon's health is below 50, and can open doors for him. They
    should not be attacked by Gordon, because if he does so, then they will run
    away from him.
    *Security Guards*
    Weapon: Glock 9mm.
    Health: Medium.
    Speed: Medium.
    Special Abilities: High Security Clearance.
    The "Barneys" are mainly the combat ally for Gordon. These guys are not seen
    too often, so he should treat them specially. They are not afraid to move when
    they are shooting, and can be effective against weak targets. Because they are
    not too strong against most targets, they should be used for support. Like the
    scientists, if Gordon attacks the guards, they will shoot him.
    3.4 >Enemies<
    There are many hostile forces to encounter, and they are not stupid. Gordon
    must take these foes out as quickly as possible.
    The military are not at all friendly to Black Mesa, and are very hostile to
    Gordon. They are very smart and will do everything they can to flush him out!
    The soldiers can use radio communication to send alert to any of their nearby
    squad. There are also some mechanical technologies that the humans use.
    Weapon: MP5/M16, Grenades.
    Health: Medium.
    Speed: Medium.
    Special Abilities: None.
    These are the standard soldier Godron will encounter. They are very numerous
    and a threat. The Troopers wear gas masks.
    *Shotgun Grunt*
    Weapon: SPAS-12 Gauge, Grenades.
    Health: Medium.
    Speed: Medium.
    Special Abilities: None.
    These soldiers only carry the SPAS-12, so they are more dangerous when up
    close. Take them down from afar. The Grunts wielding shotguns wear
    Weapon: MP5/M16 with Grenade Launcher, Grenades.
    Health: Medium.
    Speed: Medium.
    Special Abilities: None.
    Apparently only African-American, the Grenadiers are very dangerous due to
    their skill with explosives. They also have a cigar in the normal version, a
    beret with the high-definition pack.
    Weapon: MP5,M16 (with Grenade Launcher), SPAS-12, Grenades.
    Health: High.
    Speed: Medium.
    Special Abilities: Alert Squad.
    The squad leaders are the highly respected officers of their platoon. They will
    alert their squad if they detect Gordon, so if he is going for a stealthily
    approach, he should take them out first. They wear a beret.
    Weapon: Stationary Rifle.
    Health: High.
    Speed: N/A.
    Special Abilities: Hidden locations.
    These are not directly visible, so Gordon should use explosives or a heavy
    weapon against these. They can also be taken out with any other weapon, but it
    is hard to do so. The best way to take out most of these is to lob a grenade at
    their position.
    *Female Assassin*
    Weapon: Glock 9mm (Silenced).
    Health: Low.
    Speed: Very Fast.
    Special Abilities: High Jumping.
    The only Black-Operatives Gordon meets (The majority is confronted by a rival,
    Corporal Adrian Shepard), they are vulnerable when stationary. They are fast,
    so explosives will work best on them.
    Weapon: Gun.
    Health: Medium to High.
    Speed: Fast deployment.
    Special Abilities: Laser activation.
    Most of these are green and on the ground, but some are on the ceiling, can be
    used by soldiers, and a few even belong to the world of Xen! Take the common
    ones with any of the soldiers' weapons, and take the Xen ones with something
    powerful, such as the Tau Cannon.
    *Osprey Helicopter*
    Weapon: None.
    Health: Very High.
    Speed: Fast.
    Special Abilites: Infantry Drop.
    These are very hard to destroy. The best way to put them out of the skies is to
    target their fuel canisters on their wings with rockets. Other than deploying
    infantry, this helicopter is not much of a threat.
    *Apache Helicopter*
    Weapon: Gun, Rocket Launcher.
    Health: High.
    Speed: Fast.
    Special Abilities: None.
    These are the combat equivalent of the Osprey. A rocket or two will take them
    out easily, though it can be destroyed by the guass, or even the handheld
    automatic weapon!
    *Medium Tank*
    Weapon: Turret.
    Health: High (Can only be destroyed by explosives).
    Speed: Fast Turning.
    Special Abilities: None.
    This armored vehicle is a very big threat. Take it out if Gordon sees it.
    *Light Tank*
    Weapon: Rocket Launcher.
    Health: High.
    Speed: Fast Turning.
    Special Abilities: None.
    This is the lighter version of the tank. It can be taken out with the Tau, the
    rocket launcher, or any other explosives. Try to avoid its missiles.
    The Xen invaders are very numerous and can teleport to earth at unexpected
    times, so Gordon should be aware of this.
    Weapon: Claws.
    Health: Low.
    Speed: Slow.
    Special Abilities: None.
    The weakest creature in the game, yet the most common. The headcrabs can be
    hidden everywhere, so Gordon should watch out.
    Weapon: Claws.
    Health: Medium:
    Speed: Slow.
    Special Abilities: None.
    This is the result of what happens when a headcrab attaches to its host. Take
    these out far away, since they only have melee attacks.
    Weapon: Spit Acid, Teeth.
    Health: Medium.
    Speed: Medium.
    Special Abilities: None.
    They have something against headcrabs for some reason. Anyhow, these creatures
    are no friendly ones. Don't get up close to them unless Gordon has a death
    Weapon: Tongue, Mouth.
    Health: Low.
    Speed: None.
    Special Abilities: None.
    It's fun to see other people get sucked up into the barnacle's and get digested
    by it, but of course, it's not as pleasant when Gordon is. Avoid or kill these
    *Vortiguant Slave*
    Weapon: Lightning, Hands.
    Health: Medium.
    Speed: Medium.
    Special Abilities: Night vision.
    The first Xen creature that has a brain that Gordon encounters, these shy
    Xenizens don't attack Freeman because of their own will, due to slavery in Xen.
    Their lightning attacks are deadly, so Gordon must be quick against them.
    *Vortiguant Soldier*
    Weapon: Hivehand, Hands.
    Health: High.
    Speed: Fast.
    Special Abilities: Night vision.
    These creatures are really meant for combat. They are more deadly than the
    slaves and the soldiers! If Gordon is to encounter one of these, he should
    take them out.
    *Vortiguant Controller*
    Weapon: Energy Orbs.
    Health: Medium.
    Speed: Fast.
    Special Abilities: Fly!
    The boss Xen characters are only seen towards the end of the game, and boy do
    they get in the way! Take these out first.
    Weapon: Teeth.
    Health: Very Low.
    Speed: Very Fast.
    Special Abilities: None.
    These are usually released in vents or by Gordon himself. Because of their
    small size, bullets don't usually work against them. Explosives, on the other
    hand, are effective.
    *Baby Headcrab*
    Weapon: Claws.
    Health: Very Low.
    Speed: Slow.
    Special Abilities: None.
    These creatures are only found on Xen, created by Gonarch. Because of their
    small size, they are even more annoying! Take them out with explosives.
    Weapon: Flamethrower Hands, Sonic Stomp.
    Health: Very High (Can only be killed by explosives).
    Speed: Fast.
    Special Abilities: Bulletproof Armor.
    Considered "Mini-bosses", these are very big threats and should not be attacked
    head on. Fortunately, there are more convenient ways to defeat Gargs.
    Weapon: Teeth.
    Health: Very High.
    Speed: Very Fast.
    Special Abilities: Water only.
    The best weapon to use on this shark-like alien is the crossbow, as it is the
    few weapons to work underwater. The other weapons are the crowbar, the handgun,
    and the bazooka. These can be shot from above the water, but it is difficult to
    Weapon: Tentacles.
    Health: Must be destroyed by environment.
    Speed: Cannot move.
    Special Abilities: Sensitive Listening skills.
    Tentacles are very deadly and should be avoided if possible. They can be
    destroyed by fire, but Gordon will have to search the area for an
    appropriate flamethrower. Gordon must distract the Tentacle(s) with explosives
    to buy some time to maneuver.
    Weapon: Spit Acid.
    Health: Very High.
    Speed: Fast.
    Special Abilities: Create Baby Headcrabs, Bulletproof Top.
    Dubbed "Big Mama". This is one of the main creators of headcrabs.
    Weapon: Lightning Attacks, Teleport.
    Health: VERY High.
    Speed: Medium.
    Special Abilities: Heal from crystals.
    The final boss of the game, to beat this creature, Gordon must destroy the
    three crystals above and shoot the insides of his head.
    4.0 >Walkthrough<
    Here's the noticeably linear walkthrough for the noticeably linear story mode.
    4.11 >Black Mesa Inbound<
    The Game starts at "Black Mesa Inbound", and that chapter is one of the more
    passive ones, so if Gordon's not interested at looking at the scenery, he
    can change the level to c1a0 to skip to the first "real" chapter. There are
    some notes connecting to its expansions however:
    1. The security guard knocking on the door at the beginning is the actual
    Barney Calhoun, whom the player plays as in the game "Blue Shift".
    2. Most of the area is "revisited" by Barney Miller in the game "Azure Sheep".
    3. The G-man can be found near the end of the chapter. This man will follow
    Gordon throughout most of Black Mesa. Regardless, he is NOT the administrator,
    Dr. Wallace Breen is. Also, the place where he first appears is also an area
    "revisited" by Adrian Shepard, a soldier in "Opposing Force".
    4.12 >Anomalous Materials<
    The true first chapter, all that's needed is to get the H.E.V suit and go to
    the test chamber. There are some fun things to do here as well.
    Gordon is late. He goes to the lobby and the guard there says that he needs to
    get his H.E.V suit and to then hurry down to the test chamber. Towards the
    Research Labs, he can also spot the G-man arguing with a scientist. Before
    entering the locker room, Gordon can check out the room to his right. A pair of
    Scientists are eating lunch, and Gordon can mess around with the microwave! The
    locker room holds the suit, and Gordon can also grab a battery from his locker.
    He then must follow the blue line on the wall towards the Development Labs. The
    guard will let him in only if Gordon has his suit. Gordon then goes down the
    elevator (or down the ladder, which is quicker), and then runs through the
    hallways leading to the test chamber. In the middle of the jog, he meets 3
    of his colleauges telling him that they are taking advantage of the situation
    that they currently have and that Dr. Breen, the administrator, had gone
    through a lot of work getting the crystal sample, and is demanding to get
    some sort of analysis for his efforts.
    One of the scientists open the door for Gordon to get through and in the next
    room, Dr. Eli Vance and his colleague try to fix some equipment that has gone
    wacko. Down the elevator and through the hallway, two more scientists argue
    about the dangers of a disaster. After the conversation, they open the door for
    Gordon to get through. Later, Gordon is asked to turn on the switch above at
    the catwalk. Once he does, the other workers activate the working sequence.
    Once they announce that the sample has arrived, Gordon must push the crystal
    carrier into the portal. Unfortunately, disaster strikes and Gordon must watch
    something unnatural unfold.
    4.13 >Unforeseen Consequences<
    No matter what Gordon can do, he still causes a resonance cascade. Aliens are
    everywhere, and many human casualties are occurring!
    When Gordon regains consciousness, he must retrace his steps. When he
    backtracks, he'll meet Dr. Vance and his colleague in great worry. Dr. Vance
    tells Gordon that he needs to get up to the surface and send help. He then
    opens the door to let Gordon through. He must then keep going, dodging any
    obstacles in the way, and during so, he'll get a crowbar. Smash his way through
    the door and into the elevator to the elevator, where it has malfunctioned,
    killing the scientists inside. Down where the screwed-up transport had landed
    is a battery. Up at the top level is a guard shooting some zombies. When Gordon
    approaches him, he is relieved to see Gordon alive and is wondering what he
    killed. Gordon should then ask the guard for his help and then retrace his
    steps once again. Along the way, the two will encounter two more zombies.
    Gordon can deal with them himself, or let his companion kill them. Once they
    have been dispatched, the two will come across two familiar hallways. The
    lockers in the locker room have 9mm ammo and a battery, and also has a
    first-aid station. The hallway leading to the lobby is the way to proceed to
    the next area. But first, Gordon should go to the tram entry, where a scientist
    soon grabs on a rope for his life, and falls. There’s a round of 9mm ammo there.
    Gordon should go through the tiny hole where some electrical equipment falls
    onto headcrabs (and could possibly kill Gordon if he isn't careful). Some of
    the equipment are laid down for Gordon to go through another hole. In a nearby
    room, a scientist is dealing with a headcrab. He kills it, but then he is
    defeated by another. Gordon then learns the origin of the zombies. Speaking of
    zombies, one on a chair has gone crazy in the other room. Gordon can kill it.
    Gordon proceeds through the hallway, where he sees a guard that has killed a
    zombie who has also been killed by it. Grab his pistol and take advantage of
    the first-aid station, then go through the doors.
    Gordon opens the door and finds a scientist under attack by some houndeyes.
    Slaughter them all and get the scientist to follow Gordon. When Gordon
    continues through the hallways, the G-man watches him on a catwalk. If Gordon
    shoots him, he will be unharmed, but will leave early. More houndeyes will come
    attack the bumbling scientist in the H.E.V suit. Kill them. There’s another
    first-aid station in where one of the houndeyes came from. Behind one of the
    doors in the walls is another headcrab and a passage to some decent supplies.
    Gordon should climb the ladder and shoot the barrels, massacring the headcrabs
    and the zombie. To the right, a scientist is willing to open a door for Gordon.
    He can lead the scientist to an armory, where a dead end and a zombie lies.
    The question is this: If this is a dead-end, then where is the G-man? Anyhow,
    kill the lone mutant and the civilian will open the door for Gordon, where some
    9mm ammunition, some grenades, and a first-aid station is. Back at the lower
    areas, Gordon continues to walk through the hallways, where a headcrab is
    attempting to attack a scientist in a dumpster. Kill the headcrab and Gordon
    will hear a door get destroyed. The first Vortiguant decides to attack Gordon.
    After the Vortiguant dies, there’s some ammo where it spawned from. There's a
    sewer hole. Inside is a headcrab. Gordon can kill it. Also, on the other side
    of the fencing, a zombie climbs up from the other manhole. Gordon should kill
    it while it's climbing up. After the kill, Gordon should jump into the sewers,
    turn the wheel inside, and swim up to the other manhole.
    When Gordon goes across the hallway, he will see a giant platform. On the upper
    tier, there's a switch next to the dead security guard. Activate it and go onto
    the platform. The platform will go down, and headcrabs will begin to fall
    above. For a quicker way to deal with this, Gordon can jump onto the slope on
    the right and slide down unharmed. There’s a first-aid station here, as well as
    some boxes on the other side. Throw some grenades at the boxes. To get to the
    other side, Gordon can walk on the ridge near the wall. A houndeye spawns here.
    After killing it and getting some 9mm bullets, Gordon will come across a bridge
    which gets destroyed by a bullsquid. The bullsquid then falls to its death.
    Gordon must climb along the pipes and into the vent. Go to the far side of the
    vent, grab the batteries, and then shoot the barnacles hanging from the ceilings
    of the huge room with the canal while the bullsquid is killing the headcrabs
    below. When it's done, Gordon should kill it and any remaining headcrabs that
    the bullsquid hasn't killed. He can jump safely into the canal river, making
    sure that he doesn't get grinded in the generator. To the left is access to the
    other side of the canal. When he goes through the door, he gets to another
    giant room, this time with hanging boxes. Climb up and navigate from box-to-box
    to get to the other side. Simply go through the hallways and proceed through
    the elevator, towards the next chapter.
    4.14 >Office Complex<
    This is a chapter that takes place at a more "civilized" area, where there’s
    tables, rugs, and such. Gordon will also meet a lot of friendly people here.
    To the right of the elevator exit, there's headcrabs being massacred by an
    electric wire. The wire will also electrocute anything else, including
    protagonists in H.E.V suits. Go inside the vent, and to the left, throw a
    grenade inside where the fan is. Return to the right, and break the vent door.
    A scientist nearby is getting eaten by a barnacle. Shoot it and the other two 
    in the room. The other scientist at the table, says that most of the science
    team is heading for the surface, but he plans to stay here and wait for some
    rescuers. Inside the room is a door (not leading to where Gordon started),
    which has a switch that will turn off the power in the area. Now that the
    power is off, the wire is no longer a threat. Before Gordon goes to the next
    area, he can go back into the vent and get the ammo where the fan was. Now go
    through the window and keep going onto the hallway, breaking all the boxes.
    A shotgun is in this room. Collect it and shoot the zombie that's about to
    ambush the guard on the other side of the door. He will then unlock it for him
    to a room with a headcrab, some ammo, and some health kits. Tell the guard to
    follow and go back to the nearest area with the double-doors. Behind the wooden
    door is a zombie that trashes the tiny room inside. DO NOT kill it until it
    breaks the door open. After killing it, collect the ammo inside and go to the
    flooded room with a hanging scientist. Tell the guard to hold position and go
    into the flooded room. Note that Gordon can shoot the hanging scientist. He
    must go from table-to-table without touching the water to a switch that will
    turn off the electricity in the room. Gordon can break open the vent and shoot
    more headcrabs inside. Climb in and duck, making sure that Gordon's head isn't
    severed off by the fan. On the other side of the vent, Gordon will fall through
    the ceiling. Open the door in front of him to let the guard through. Behind are
    some crates and headcrabs that fall through the ceiling. Kill them and set up
    the boxes to let Gordon climb up them and onto the ladder above. After
    crouching through the vent, a ceiling turret will activate and will shoot the
    scientist and unless Gordon is quick enough to reach the switch beneath the
    turret, will kill him. After deactivating the gun, go through the door, nabbing
    the ammo, and unlock the other door to let the guard through. Travel to the
    hallway where the turret was, and throw a grenade at the headcrabs. Proceed up
    the stairs.
    On the top level, another security guard is firing at more headcrabs! Have him
    follow Gordon and proceed an office area that vortiguants have infested. Go
    to the room on the left and collect the med kit and battery, watching the
    scientists fall through the vent. Proceed through the hallway and blast any
    vortiguants with the shotgun. Left goes to more aliens, and more rooms. Explore
    the area, and then go to yet another hallway with another pair of vortiguants.
    At the end (after shooting the barnacle), there’s a room with a scientist. He
    says that he doesn't want to go to the surface, due to what they did in Black
    Mesa. Return to the opposite side of the complex and fight the vortiguants
    hiding behind the vending machines and the hallway. There's another scientist
    who tells Gordon that he found out that soldiers are on their way to rescue the
    science team. Up another staircase is a turret on the other side, where Gordon
    should take out right away with grenades and his Glock. Another method of
    dispatching it is to go into one of the rooms, smash the ceiling, and
    deactivate the power next to the turret. Also, some headcrabs, a zombie, and a
    pair of vortiguants are at the hallways.
    Anybody that is currently following Gordon will refuse to continue, due to a
    hidden headcrab on the vent. Take it out in order for Gordon's allies to
    advance. Additionally, another security guard is waiting. Apparently, the
    military rumor has been quickly spread. Down the ramp is a bullsquid and an
    ammo depot. Yet another pair of vortiguants spawn in the room. After taking
    them out, Gordon should go through the vent near the door he came in and make
    his way through the vents to a room with a cache of ammo and grenades. He
    should then run back to the guard and then throw all of his grenades at the
    cafeteria with all the zombies and headcrabs. The two proceed to the kitchen,
    infested by Xen wildlife.
    The first area contains two zombies, the other is a room filled with corridors,
    bullsquids, and headcrabs. In some areas are some ammo, in a corridor, there's
    a switch that will activate a moving platform above. From where Gordon started,
    he must climb up the ladder, and move through the counters to the moving
    platform, destroy the boxes on the platform, and move to the other side. When
    Gordon is through the first vent, he will come across a vent complex infested
    by barnacles. Kill them all, collecting their bounty, and jump to the upper
    vent. There's a headcrab or two inside the vents, just to let Gordon know.
    Gordon goes to the other side of a door in the cafeteria. Here, a security
    guard fails to recover another. Meanwhile, a zombie chases a frantic scientist.
    Annihilate the hybrid and let the security guard know that Gordon needs his
    help. Up the stairs is a headcrab. On the other side of a locked door, the
    G-man observes Gordon, and then walks to another room. At the wide corridor, a
    zombie falls from a top hallway and another zombie breaks out of a wall. A
    scientist escapes a room and runs away from the scene. Take the two freaks out,
    and collect the ammunition in the rooms. The guard says that the elevators are
    out of order, but that everyone can still climb. That's what Gordon needs to do
    to get to the next chapter. Jump across the elevator shaft, and climb up to the
    elevator. A scientist looses his grip on the elevator, but Gordon can still
    make it up there. Then he goes inside the elevator (breaking the panel) and
    goes out.
    4.15 >We've Got Hostiles<
    This is the first chapter that features the military. Gordon should not expect
    the marines to be kind with his company. Watch out! They're very smart!
    Shoot the tripmine ahead. The scientist bangs on the window trying to get the
    security guard to open the silo door, informing what Gordon needs to do. The
    unfortunate soul gets perished by a zombie from a vent. The scientist goes
    crazy and runs to the hallway, and gets killed by a turret. Gordon should
    charge up his suit and his health, and continue. In the next room, he must
    throw a grenade at the turret. He can then blow up the explosives box and nab
    the soldier's weapon (MP5/M16). He should then shoot the door's panel to close
    the door, and escape, evading the tripmines.
    The next area spawns a vortiguant slave. After killing it, Gordon comes across
    two turrets. Taking one out with explosive barrels and killing the slave that
    spawns behind with another pair of barrels, Gordon can now climb up the crates
    and escape the scene, closing the fire door behind, and ignoring the turrets.
    In the next area, two scientists are about to get attacked by another pair of
    turrets. Destroy them, and the tripmines ahead. The G-man again watches Gordon
    from a catwalk, and walks to the right. Gordon climbs up to the catwalks
    (checking the boxes for provisions) and sees a marine waiting for a scientist.
    The bad thing is, the marine becomes hostile to the scientist and kills him 
    (unless Gordon is smart enough to kill the soldier first). Grabbing the 9mm
    ammo on the table, he goes up the elevator. Another scientist runs foolishly
    towards a whole squad of troopers! After killing them and using the charging
    stations, he goes to a pair of catwalks with many barnacles! I don't need to
    tell everybody what should happen next. Going right, and then running against
    the conveyor belt, he comes across a supply area with two charging stations,
    and plenty of ammo. Climbing up to the next conveyor belt, Gordon encounters
    another marine above some turrets. Dispatch him, and then the turret on the
    right of the marine's position (below). Then target the tripmine and rush
    through the door. Two more scientists rush towards another squad of American
    infantry. Dispatching them all, and collecting the ammo, Gordon runs up the
    stairs, across the catwalk, and he should then throw some grenades at the
    grunts below. Also, Gordon may feel free to take out the barnacles over the
    conveyor belt. He then grabs the supplies he needs (a battery is in a box) and
    goes up the elevator.
    The next area is highly dangerous, mainly because of the osprey helicopter, and
    the airstrikes. Gordon MUST rush into the nearby bunker and down the ladder,
    ignoring any marines that try to assassinate him. At the bottom of the ladder,
    there is some boxes that contain a wealth of 9mm ammo and a pair of charging
    stations. Gordon should then hurry downward to the wide vent. A fan is in the
    middle of the vent junction. At the nearest gap in the left vent is some
    shotgun shells and two turrets. A junction is in the vent after the gap. The
    right shows a headcrab. The path on the right leads to some 9mm ammo and two
    soldiers complaining on their mission. It seems that the soldiers' mission is
    to eliminate any witnesses on the project. The other path leads to a room with
    some supplies and vortiguants that spawn on the other side. The vent beneath
    the fan (at the junction) leads to more shotgun shells. Make sure that Gordon
    crouches under the fan. At the bottom, there's a vent leading to another vent
    that gets Gordon to the silo controls. There, a nearby scientist informs Gordon
    that he must get to the Lambda team to stop the madness. But to get there, he
    must get through the silo complex, and worm his way in an archaic rail system
    (as the transit system is out of order). Gordon should open the silo door and
    charge his health and armor at the power stations before he goes through.
    4.16 >Blast Pit<
    This is one of my least favourite chapters that don't take place on Xen. Also,
    Gordon should conserve his ammo here, because there are hardly any ammo depots.
    There's a tentacle trio that Gordon needs to get past. He must find out a way
    to destroy it.
    Gordon must hack his way through the barricade and kill any headcrabs and the
    bullsquid. There's a control tower with a switch to activate an elevator. A
    zombie bashes through the door next to it. Inside the room it came from is a
    pack of grenades. When the elevator comes up, Gordon must then go down an onto
    the train (this is NOT the old rails the scientist was talking about). Avoiding
    the aliens nearby, Gordon eventually gets launched up into the air. He should
    try to land on the nearest crate. Kill the bullsquid ahead, and make his way
    across the boxes on the toxic waste to the other side. Into the pipes he goes.
    He then should kill the two bullsquids and jump across the pipes and onto the
    platform. Collect the supplies, run across the pipes and onto the elevator.
    Some houndeyes attack Gordon. Shoot them all. Also, shoot the barrels on the
    bridge and the headcrabs on the other side. Walk across the small pipes to the
    door into the silo. A zombie comes in after Gordon opens the other door. Blast
    it with the shotgun. He then comes across a dying scientist whose last words
    tell Gordon how to destroy the tentacle creature ahead (using a rocket engine).
    Another scientist in the control room attempts to activate the engine, but one
    of the tentacles grab him into the dangerous field. According to the controls,
    Gordon will need to unlock the fuel & oxygen pipes, as well as to turn on the
    power. Kill the barnacle near the ladder, climb up it, and a security guard
    will tell Gordon that the Tentacles do not see, but hear, and they have very,
    VERY sensitive hearing. Gordon can either distract the "outer space octopus"
    with grenades, or walk across the walls to get to the two areas. Either way,
    he should destroy the barricades with grenades.
    The first airlock Gordon comes across leads to the fuel & oxygen pipes. There's
    a manhole leading to a sewage system. But first, there are two zombies in the
    way. Climb down, go left, and climb up the ladder. Another zombie is here. Grab
    the grenades and then shoot the two zombies on the other side of the door.
    Climb down to the bottom area and turn on the switch. Now quickly climb back up
    and then jump onto the fan's covering area. It will make Gordon levitate to the
    top, where he needs to smash another huge barricade. Gordon must make his way
    through the vents and then when he reaches the fuel & oxygen controls, he must
    deal with some zombies and a headcrab. He can then backtrack to the tentacles
    area. Gordon should then go to the bottom. Save the grenades though, he'll need
    it later.
    The next area leads to the power generators. First off, some houndeyes rush
    towards Gordon's position. After killing the herd, he must turn a bullsquid
    and a few barnacles into a bloodbath. Before he proceeds, he should push a
    metal crate to a bigger crate so Gordon can walk across the pipes next to the
    wall (the reason is explained later). Activate the elevator, but don't ride on
    it, as it will drop Gordon into a tub of anthrax. Instead, he should climb down
    the ladder. When he's down, a scientist near the electric generator says that
    he sent his colleague, Smithers, to turn on the power, but he never appeared
    again. Gordon should walk on the huge pipe across the waste and kill the
    zombie. He can use the moving platform (a bullsquid is below) to get to the
    upper levels. Avoid the moving platforms. On top of the silo core, Smithers
    refuses to move until the disaster is over. Turn on both switches on both sides
    to turn on the electricity, trapping the coward on the generator for eternity.
    Return back to his colleague, who has announced that the power is on and the
    engine will be running. Climb up the ladder, and at the top, land on the
    elevator's roof. Here, since the power is online, Gordon will need to climb up
    the boxes and onto the wire on the wall to get past the electrocuted water.
    Return back to the tentacle-infested silo and quickly return to the top tier.
    There, Gordon must turn on the rocket engine, burning the tentacles so Gordon
    can get past. He can then go to where the tentacles last remained and climb
    down the tunnel. Above at the pool, where what remains of the mostrocity lays
    is a revolver with its .357 ammo. Keep swimming down and at one of its edges has
    an opening to some stations and some pipes to the next area. Run across the
    pipes, switching from one to another to a rather large one with a wheel. Turn
    it and Gordon should be able to get to the other side. At some time, the pipe
    will collapse and Gordon must land on the table. It's a long fall, but he will
    be healed by the med kits on the table, squishing the headcrab. The boxes
    contain lots of useless tripmines, so only look for the health kits and ammo.
    Gordon may run to the next chapter.
    4.17 >Power Up<
    Back to the marines, Gordon will need to retrace his steps often here. He needs
    to turn on the train power and the track power.
    The G-man is on the control terminal, watching Gordon. Meanwhile, a Gargantua
    is massacring two marines. Use this as a distraction and run to the hallway
    across the other side. A vortiguant slave runs toward him, but he can take it
    out with the barrels. To the left, there's a fuel leak. After that, more
    vortiguants ambush Gordon. The bridge collapses. Gordon should check the boxes
    for supplies and kill the headcrabs that run away. Destroy the barricade and go
    through the door to find a wounded security guard. He tells Gordon to turn on
    the power and warns him that there's many enemies between them and the
    generator room. There's many helpful supplies here and a pair of charging
    stations. Down the ladder, there's a pack of headcrabs. There are many aliens
    to deal with to the next area, but Gordon can take them out easily, since
    there's a lot of barrels for the last batch.
    Towards the door to the toxic pit are two upper levels. The first has a soldier
    getting eaten by a bullsquid. Shoot the bullsquid through the hole and grab the
    ammunition. The next tier alerts a soldier. When Gordon is on the second level,
    he should give the marine a clean shot to the head with the revolver. The room
    above has a turret, another trooper, and some boxes filled with supplies. One
    of them has a round of bolts for the crossbow, which will be needed later.
    The next area has a commando inside a garrison. Shoot the explosive boxes.
    Collect the stuff and then when Gordon goes up the ramp, another commando
    alerts his squad at the left balcony. Take him out and massacre the squad of
    men in the radio room. Make sure the vent doesn't get destroyed, because if the
    shaft gets open, headcrabs will spawn out of it. Check the zone for ammo, and
    then return to the radio room and turn on the elevator. First, Gordon should
    throw a nade in the elevator (there are tripmines at the bottom floor). Then
    go down, killing any houndeyes on sight, and turn left at the big room. The
    spiral leads to the generator. Shoot the headcrab ahead and proceed downward.
    Instead of taking the sucker's way and going directly to the boxes to smash
    them, shoot the boxes to de-jam the generator. Then return to where the
    headcrab was and run to the controls. Then detour back to the radio room,
    killing the squad of soldiers that comes down the elevator. Another squad has
    returned to the area! Kill the commando and then shoot the boxes up ahead to
    dispatch the other foes. Return to the control room with the wounded security
    guard, assassinating any enemies that get in Gordon's way.
    The door behind the Gargantua is now open! Make a run for it and go to a room
    with two enormous electric coils are. Go behind them and turn on the switch.
    This will annihilate the Gargantua for good. Go back to the main area and make
    the train go to the turntable. Return to the control room with the guard. He
    tells Gordon that he can't go with him. Go to the switch and drive the train
    through a barricade.
    4.18 >On A Rail<
    From here on, I will classify the marines specifically, since this chapter
    introduces more types of infantry.
    A guard at a rail stop says that Gordon needs to launch a rocket to let the
    Lambda team know his arrival. The military aborted the launch, so Gordon needs
    to put the rocket into the skies himself. After his speech, take out all of the
    barnacles on top of the elevator and ride the train there. Keep riding through
    the flooded rails onto a dryer area.
    I should tell Gordon this: There are these switches on the walls. The purpose
    of these will turn the train to an alternate path. To turn these, shoot it.
    They are hard to miss and are mounted on the walls. Gordon must go open a door
    to get through, but he needs to get all the way across the other side to the
    controls. Make his way through the rails, killing any aliens and he will
    eventually come across a rail station where a bullsquid and a headcrab have
    taken charge. Collect the supplies and smash the boxes and the turret.
    Backtrack to the area with the door, shoot the switch, and drive on. Note that
    there are other tracks to go to, leading to supplies, but I avoid those.
    Now it's where it gets fun! Before Gordon drives his train to the platform, he
    can see a commando's pair of legs. Shoot them two times with the revolver and
    then go up. Another two troopers are on another elevator, so shoot them while
    the rival elevators go up. At the end of the upwardness, a grenadier is on an
    unsafe wooden plank. Shoot him in the head and then continue forward. A battle
    between the soldiers and the vortiguants occur. Sneak past this and drive the
    train to a stop, with a turret. Kill the trooper next to it and then take the
    remainder of the squad with the turret. On the side with the dead aliens lead
    to some headcrabs, the troopers Gordon dealed with at the elevators, and a
    power station. Gordon can turn on the switch and drive his train to the next
    place, but he should get off it after he accelerates it and walk to the turret
    area. On that side is some stairs. Throw some grenades up the stairs and then
    take the bounty. A trooper is hiding in a room, while some vortiguants ambush a
    commando. Kill the living things, destroy the tripmines below, and then go to
    the parcel room, destroying the boxes that aren't on the shelves for some .357
    ammo. Go down the stairs and kill the trooper. Destroy the box underneath the
    stairs and destroy the vent. Crawl underneath and collect the satchels and
    killing the headcrab, hearing gunshots from above. The vortiguants will most
    likely win, as the marines above are recruits. Back above, kill any survivors
    and then man the train (checking the place for supplies) and move on.
    There’s some grunts and a commando on the left of the rails. Throw a grenade or
    two and collect their weapons from their bodies (or what's left of them). Go to
    the hallway on the right of the rails and sneak past the battle and into the
    tiny room, breaking the barricade and boxes. The guard nearby will take care of
    the conflict. When all the enemies are vanquished, there's a room with a
    battery, a first-aid station, and headcrabs that fall from the ceiling. The
    next area has some boxes and a turret. Kill the trooper manning it and open the
    fire doors. Detonate the tripmines and then dispatch the trooper at the bottom
    tier in the silo. Go down where the marine was and then collect the .357 ammo
    in the office. Also, there's a hidden H.E.V charging station. Then drive the
    train. Duck underneath the lasers and shoot the two bullsquids with the
    revolver. There's a door leading to another bullsquid, some corpses and ammo.
    Driving onto the next area, a rocket turret fails to get Gordon. Shoot the
    tripmine next to its wielder and drive on. Shoot the next tripmine. Voriguants
    and a first-aid station wait at the next train station. Turn the aliens into
    corpses and then detonate the tripmines. A few headcrabs wait above the
    tripmines. One of the crates above the stairs contains a satchel. Also, there's
    a commando and a grunt guarding a control panel that will open the gates.
    There's even an armor station next to the panel. Instead of going back to the
    original train, jump in between the rails and search for a second train. Use
    it and drive on. If Gordon takes the other train, a trooper will use the
    "real" train and Gordon will come across a trap. The next area to the right has
    a turret, and a nasty platoon. Launch a grenade at the turret and clear the
    area. Then use the switch next to the turret's bunker to open the gate. The
    next place has an elevator to the right. Break the boxes near the elevator and
    put the satchels inside the elevator. Gordon should now drive his train and
    detonate the satchels, watching some gore fly by. Ignore the trooper and then
    when Gordon's all the way to the top, he can go into the room with boxes and
    break them. Down a floor via the ladder, he can collect the satchel nearby and
    toss it down, detonating it when it reaches the bottom. Return to the train and
    drive past the electricity and detonating the tripmines.
    There's an area where crates are being transported throughout. Behind the set
    of stationary boxes is a grenadier and a commando. Keep driving the train,
    avoiding the bad guy with the rocket turret (or kill him). Soon, Gordon will
    come across a switch. Shoot the switch so Gordon won't retrace his steps. He
    will then come across a hole in the rail. The best way down is the stairs. When
    the loading starts, he should toss an explosive down, which will set off the
    tripmines and a turret. Jump across the red laser and take out the zombies in
    the office. There's also a cache of grenades and a first-aid station inside.
    Knock down the other three turrets and run across the rail. A bunker turret
    and a commando are armed to the teeth. Take out the guy manning the turret,
    then kill the commando. Collect the provisions and move on.
    Outside, two soldiers talk about Gordon. After the conversation, launch a
    grenade at their position. A sniper is also here, on the cliff. Launch another
    grenade from the automatic weapon at the camo area. The box contains some
    shotgun shells. Enter the red fire doors. A squad containing a trooper, a
    grenadier, and a commando are blocking the way to the rocket control station.
    Take them out with the gun on the opposite side. Enter the rocket bunker and
    use crates to get up the stairs without detonating the explosives in the area.
    Another couple of marines complain about their mission. Shoot the both of them
    and then go to the bunker controls and launch the missile. Return to where
    Gordon dispatched the marines and enter the newly open door and go down the
    stairs. Collect the ammo and drive the train towards the next chapter.
    4.19 >Apprehension<
    Here, some new creatures infest this area, as well as some other obstacles.
    The train doesn't stop! Then it goes into the water and crashes! Gordon can
    skip this paragraph and jump to the water body opposite of the train, but just
    in case, I'll give the walkthrough for getting to the other side if Gordon
    stays on the train. Go down to the bottom and break the padlock, allowing the
    barrels to float to the surface. Go downward and go up the stairs, destroying
    the zombies along the way, and jump across the bridge of barrels. Then walk
    along the hallways and into the water.
    Swim across the flooded place and then Gordon will come across a ramp leading
    to the end of the water. There's also ammo in a room along the way, there's a
    path leading to it, but Gordon must be an active swimmer to get to it. The next
    room holds an ichthyosaur, which eats a doomed scientist. There are barnacles
    swarming the area, so kill them. Up the ladder is another scientist, who tells
    Gordon all about the Ichthyosaur. There's another pair of charging stations
    here. In the cage is the mighty crossbow. Use it on the Ichthyosaur, dodging
    its attacks. When it dies, turn the wheel and duck underneath the door.
    The next room contains many barnacles. Kill them all and then smash the
    vortiguants that spawn in the tight area. Collect the shotgun shells and
    proceed. The next area is also flooded and contains TWO ichthyosaurs! Walk
    slowly, and jump the damaged area. Then jump into the hole in the mesh and
    swim down and through. The G-man awaits Gordon as he kills a bullsquid. Another
    bullsquid spawns after the first. Go up the ladder and go down the stairs
    leading to a tiny room with some ammo. Go back to the control panels and
    activate the switch. The pumps will start and Gordon must jump across the pumps
    without getting squished by the pumps. When Gordon makes it across, a headcrab
    spawns on the catwalk. When Gordon goes across ahead, a bullsquid spawn
    In this area, some terminals, headcrabs, and vortiguant slaves attack Gordon.
    Take the aliens' lives and charge at the stations. A scientist opens a door for
    Gordon to get through. He explains that the military is on his tail, and gives
    a hint of what the next chapter might look like. He then opens the door leading
    to a freezing area, where Gordon must run through. Shoot any aliens that get in
    his way and go down the ladder.
    This hallway has vortiguant slaves and boxes. When Gordon starts to go across,
    more slaves appear. When they're taken care of, go up the elevator. The
    security guard on the top tries to warn Gordon about the female assassins
    ahead, but then gets killed by them (who is the main character in Azure Sheep
    and doesn't die). Take the lovely ladies down with explosives and then check
    the area for batteries and charging stations (ammunition won't matter). Then go
    up the top platform and then use the switch to open the doors leading to the
    surface. As it turns out, the military has apprehended Gordon (alas the name
    of the chapter being "Apprehension",) and then the two marines talk about how
    they would torture Gordon. The choice was to put Gordon into a chamber with two
    walls closing in (a tribute to Star Wars apparently). Gordon MUST climb up the
    boxes to an area above. On the other side is another crowbar. Gordon lost all
    his previous weapons! When he obtains it, on the floor is a grate. Smash is and
    run through the tunnel to the next chapter.
    4.20 >Residue Processing<
    This starts the other half of the game. Gordon must avoid obstacles in this
    chapter, as well as a few aliens. Ammo is scarce here.
    First, Gordon should avoid the headcrabs that spawn from above and turn the
    wheel on the water silo. Then enter it quickly. Eventually, there's a vent to
    the interior of the waste factory. A security guard battles a pair of
    headcrabs. Collect the handgun round and then follow the guard, where he gets
    eaten by a barnacle. Get the handgun from whatever's left of his body and then
    return to where the dead headcrabs are. Jump across the nuclear pool. Simply
    jump across any pools of bad liquids and then swim across the water areas.
    Gordon will come across more crushing machines and conveyor belts. Simply put,
    activate the switch and then kill the bullsquid in the office. Collect
    everything and then move.
    I really don't like this chapter either. I'll make the story short. Gordon must
    dodge every obstacle he meets. He will then eventually come across a chamber
    full of barnacles. Avoid them and then proceed.
    4.21 >Questionable Ethics<
    Here's where the action really recovers. This chapter has lots of stuff to try
    out and lots of lasers!
    Go up, smash the grate and dispatch the houndeyes nearby. Shoot the generator
    to open the door. The next room contains a different type of vortiguant. Smash
    the glass blocking the button and kill the alien to open the door. The next
    place has some headcrabs in a box. Use the bunker's button to destroy the
    horde. A trooper comes in the room. Quickly lure him into the room and then
    kill him with the experimental weapon. Pick up his gun and then talk to the
    security guard ahead. He says that the area is locked down, and the only way
    to get out is to get a scientist to unlock the exit. He'll join Gordon as soon
    as he finishes his talk.
    A lobby has a squad of men. Lob a grenade at the twosome walking away. Collect
    the shells on the table and then pick up the dead people's treasures. Then pick
    off the remains of the platoon. The next area is similar to the place with the
    weapon. The only difference is that the weapon SHOULDN'T be used and there's
    a button that unlocks two chambers containing headcrabs, a crossbow, and a
    bunch of snarks. Another couple of soldiers patrol the hallway. Take them
    down and go down the ramp, where the room has some terminals. Collect the
    tripmines nearby and plant them at the unopened chamber throw some satchels
    between the first tripmines and then shoot it. Once the vortiguant soldiers
    come up, shoot Gordon's tripmines. Then kill the other one. When the door
    beside the other alien opens up, detonate the satchel. After the brawl, get
    the guard to follow and then dispatch the trooper in the corner. The hallway
    leads to a door with a crazy-looking machine. Ignore it and go to a hallway
    with glass. Break one of the panes and run through. Have the guard to stay and
    run back. While the guard shoots the headcrabs that attempt to attack Gordon, he
    can break the boxes inside the room nearby. There's a tripmine at the end. When
    the headcrabs are all dead, go up the stairs.
    Once up, shoot the bullsquids that attack and then go to the room on the right.
    Inside, turn on the button on the generator. This will emit a laser through the
    ceiling. Collect the batteries in the room. The path to the left leads to a
    conversation, where a security guard messes around with a secret weapon. The
    scientist demands him to put it down. Just after he tells the guard not to
    overcharge the weapon, the wall inside explodes. Collect the guass cannon the
    corpses leave behind and turn on the generator. Go back to the main hallway and
    go to the end, where a squad of hostile soldiers await. After dispatching them,
    collect the bounty in the boxes and in the room, as well as turning on that
    generator. The last generator is towards the left path, and inside the room,
    lots of houndeyes are here. When all four generators are turned on, go to a
    room to the left of the hallway (where Gordon is facing now) and then read the
    signs. Break the rules by grabbing a box and put it under the laser shield.
    This will make the shield go back up when Gordon activates the big laser and
    will destroy the wall. Jump down, using the pipes, boxes, and such.
    Inside the room nearby, three scientists are here as well as a first-aid
    station. The first says that they should get out before more soldiers arrive.
    The second states that they have high access and can deactivate the lockdown.
    The third warns that Gordon needs to turn off the crazy machine before they can
    move (the fourth died because of that). At the end, there's a control panel
    that will turn off the machine. Get one of the scientists to follow and go
    through the "headcrab" hallway. Then turn right and open the door. There's a
    chance that a trooper will appear on the right of the lobby. When he's down,
    get the scientist to the scanner. Use the armor station. The scientist will
    warn Gordon that the area ahead is dangerous, full of military and alien
    fights. But if he makes it through, he'll come across the lambda team.
    Outside, kill the marine and knock down the turrets on the roof. Then shoot
    the crates and move onto an area with crates. Break them open and open the
    4.22 >Surface Tension<
    This is my favourite part of the game. It is also one of the longest. For the
    first part, use the MP5/M16 the most. I will explain later.
    Here, some soldiers ambush Gordon. He should shoot the barrels they're beside
    to make things easier. After that, pick up all the stuff and then run to the
    end of the dam. Dodge the Apache’s and turrets attacks and launch a grenade at
    the turret. Then use the guass cannon at the Apache. The MP5/M16 also works,
    but not well. After the helicopter is down, go to the watery side of the dam
    and kill the ichthyosaur. Then go up the ladder on the tower and turn on the
    switch. Use the first-aid station if needed and go down to the bottom of the
    dam. Turn the wheel and go through the holes. Gordon will come through the dam
    and to the other side. Nab the battery beside the corpse and swim across the
    river. There should be some pipes that Gordon must enter.
    After crawling through, another Apache appears in the skies! Break the boxes,
    climb up, and jump across. Collect the provisions and the jump across. Run
    across the ledge and try to take down the Apache. On the top, a houndeye takes
    the area. Kill it and go to the path opposite of where it came from. A platoon
    of soldiers are here. Take them all down and enter the building. Turn the
    wheel. Collect anything nearby and go to the direction that says "Minefield".
    Throw grenades on the area to detonate the mines. Then jump into the hole
    blocked off by the fence. Then climb through the tunnels.
    The next place is a cliffside. Shoot the turret and the marine to the right
    with the crossbow. Then take down the trooper below. Climb down and dash across
    the cliffs, eliminating any soldiers. There's a large tunnel leading to a
    grunt, some supplies, and the Bazooka. Use the new weapon on the Apache that
    comes nearby. Climb up the cliffs and inside the pipe is a headcrab. Kill it
    and crawl in the pipe.
    A note from Donald "Dch48 nick" Henderson:
    "Right after you get the rocket launcher, you can run out and get the
    helicopter to start after you, then run back inside the cave. The 'copter will
    attempt to shoot rockets at you through the cliff and will actually blow itself
    up. You don't need to use any kind of ammo at all."
    This area is filled with soldiers and a tank! Launch some grenades at the tank
    as well as rockets. Once the tank is down, dispatch the soldiers and collect
    the grenades and go behind the tank. There's a cache of explosives and a
    trooper. Collect, destroy, and return back. Go to the switch and press. Go
    through the newly opened door and take down the light tank with the bazooka.
    Break the crates for some hand grenades and jump through the hole on the right.
    Throw some hand grenades down and collect the stuff in the crates. Jump over
    the sandbags and into the door.
    A vortiguant soldier lands on the left and a vortiguant slave appears on the
    right. Go to where the slave spawned and run through the hallway, jumping over
    the tripmines. At the other side of the building, a security guard struggles to
    get up. He's been hit by a sniper at a window. Shoot the sniper in the
    camouflaged window and pick up the guard's shotgun. Throw some grenades in the
    minefield to detonate the mines. When Gordon reaches the fence, he should shoot
    the sniper in the window. After that, shoot the barrels to destroy the
    generators, making it safe to climb the fence and the fallen tower. On the
    roof, there should be a hole. Fall in.
    In the room, destroy the boxes. The scientist in the room warns Gordon about
    the next room. The building is full tripmines, and if one detonates, then it
    will cause a chain reaction! Jump over the first tripmine, and then climb on
    the stair banister to get past the second. Go to the door on the left, and
    climb the boxes and into the window. Shoot the two headcrabs and the box on the
    metal platform. There's a damaged box here. Destroy the damaged sides and go
    through the box. Crouch under the tripmine in the staircase and there will be a
    headcrab in the control room. Here, activate the switch. It will bring up the 
    metal platform the box was on. Go onto the platform, and jump across and onto
    the elevator with the bronze platform. Then go down. Here, destroy the boxes
    and collect the ammo, and the hivehand if needed (which would hardly be). When
    Gordon proceeds through the hallway, a security guard runs away from his
    pursuers. Kill the soldiers on the chase and get the guard to follow.
    Here, the truck contains a turret and a box with some energy cells for the
    Tau. In the large room with the large boxes, an explosion will occur. Don't
    let the guard get killed by it. Tell the guard to stay and go up the ramp and
    to the outdoors. Run up the other ramp to the boxes, fending off the vortiguant
    soldiers and break the boxes for first-aid kits and batteries. Then a plane
    will arrive, killing the Xen soldiers. Use explosives, the bazooka, or the
    Tau to take out the light tank. Then kill the soldiers beside. Get the guard
    to follow and then go up the far side of the building on the right. A sniper is
    in a window here. Lead the guard to the locked green doors and tell him to
    stay. Go to the main building and then kill the commando and the grunt. Destroy
    the tables and the radio, along with the boxes. Up the stairs is some beds and
    a guard, who will open a door for Gordon. This is why I wanted Gordon to spend
    his 9mm ammo. There's enough 9mm ammo here to fill Gordon up even if he
    exhausted his 9mm bullets. Also, there are lots of other types of ammo here.
    Break the boxes at the end of the room. There's a switch that will turn on the
    lights if necessary. Get the guard to follow Gordon and lead him to the other
    After that, go back into the building and jump through the window next to the
    shelf. Go across the ledges, jump across the generators, and climb up the
    broken ladders. On the top, throw all the grenades at the bottom. Once done, go
    down and unlock the door. Go back up the ramp and jump from ledge to ledge to
    the next area. The helipad is no place for the chilled. Go to the door across
    and ignore the vortiguant soldiers. Run down the ramp and jump the boxes. Use
    the turret to destroy the big door. When all the vortiguant soldiers are down,
    dewing the osprey flying across to prevent it from sending soldiers. After the
    osprey is destroyed, go to where the turret was and go down. Unlock the big
    green doors and get both guards to follow. One will unlock a door. Use the
    charging stations and break the boxes. Go to the new pathway, making sure the
    guards follow through.
    Here, tell both guards to stay. Collect the 9mm ammo and use the turret to take
    down the vortiguant slaves. Lots of them spawn here. Get past them and use the
    jump pad to get to the upper floor. There's two vortiguants battling two
    soldiers. Take down the two and break the vent. A snark or two will come out.
    Use the crowbar on them and go up the vent. More snarks will come out of the
    infested area! Destroy them all with the MP5/M16 or the crowbar, and collect
    the snark packs. Destroy the grate and the soldiers will shoot the vents! Throw
    five snarks down and then run back collecting the rest of the snarks. By now,
    the squad should be finished. Wait for the snarks to explode, and then go into
    the room. Collect the bounty and the batteries. Open the door and run back,
    since a grenadier blows up the explosive box in front. When a hole appears in
    the wall, use the switch on the left to raise a platform. Before it does,
    however, jump on. Then jump through the hole, killing the grenadier and the
    commando. When they're done, use the turret to destroy the door and the
    vortiguant soldiers that come out. In the next area, kill the aliens and then
    throw all the snarks at the soldiers below. When they're done, go down and
    explore the "arena" for supplies. Climb back up and jump across the hole in the
    catwalks to the other side. Take advantage of the first-aid station nearby and
    proceed through the hallway. A vortiguant soldier throws a trooper through a
    wall. Kill the alien and watch some soldiers duke it out with some vortiguants.
    When the aliens are down, snipe the soldiers with the crossbow. Don't forget to
    take out the trooper on the roof. Above Gordon's position is another alien
    soldier, so bring it down when he's off the building. Go to the gate and enter
    the shack. Grab the shotgun. Gordon needs a Black Mesa employee to open the
    door. Use the jump pad to get on top of the roof. Break the grate and then
    crawl through the pipe. Run back as soon as the trooper throws in a satchel
    charge. The watery area is the safest place to dodge the fire. Crouch through
    the pipe and kill the trooper. In the next room, lob a grenade at the fighting
    group. When they're dead, turn the wheel in the room to open up another pipe.
    Go inside and go through it. At the end, a trooper ambushes Gordon. Kill him
    and his partner at the bottom floor. At the top, a security guard waits. Use
    him to open the door at the bottom floor. Outside, a pair of vortiguant slaves
    spawn. Annihilate them and lead the guard to the post.
    Get the guard to follow. In the garage, two marines get squashed by a
    Gargantua. Use the guard to distract it while Gordon runs for his life. The
    Gargantua will likely follow. Run through the garage without delay until he's
    outside, where he must use the jump pads to a water tower. The radio speaks.
    The man tells Cooper (the dead guy on the tower) that the military is pulling
    out and using air strikes. The map in front is for designating targets for the
    missile barrages. Use the map to take down the Gargantua. After the mighty
    alien, use it on the bunker door, the walls, and the radio tower. Climb across
    the tower towards the door. Run through the road toward the next chapter.
    4.23 >Forget About Freeman!<
    This is the last chapter featuring the soldiers. Also, it is very short
    compared to the last chapter.
    The chapter starts with some fragile ceiling rocks. Wait for three to fall and
    then jump on the third one and across to the door. A radio announces that the
    soldiers are on the retreat. If needed, use the switch to turn on a turret.
    Unfortunately, it also turns on Black Mesa Personnel as well as aliens. The 
    security guard will die if the turret is activated. But infinite aliens spawn
    here. Anyways, go down the roads, searching for ammo in the infested walls.
    There's some cocoons that hold some nasty snarks. They block the way from rooms
    that have ammo and supplies. Go left after going down the ramp and kill all the
    vortiguant slaves. Go up and turn the wheel. Note that this will destroy the
    cocoon and will unleash some snarks. Once in the sewers, Gordon must deal with
    some headcrabs and turrets. Once they all die, use a crate to get to the left
    side. The right is the wrong way. Take down the barnacles in the sewers. Kill
    the headcrab nearby. Once back in the water, avoid the Ichthyosaur and go to
    the machinery. Crouch under the gear and under the water. Eventually, Gordon
    will come across a turret. Knock it down, and take out the trooper next to the
    bazooka and rockets. Climb up the ladder after grabbing the rockets and use the
    bazooka on the tank. Also, there's a trooper and a commando here. When the
    tank's done, fill up on the rockets and crouch through the door, knocking down
    the turret. Go to the elevator after using the first-aid station.
    Here, jump over the anthrax. There's a battery or two inside this place. At one
    point, there's a commando and a trooper here. Kill them and go through the
    hallway and collect the medkit. In the arena, use the tank's turret to destroy
    the door. There's some supplies in the boxes. Slip past the soldiers and the
    aliens and go through the door on the left. Note on the way, there's a Xen
    turret. Destroy it with the bazooka. The left hallway leads to the door leading
    to the Lambda core.
    4.24 >Lambda Core<
    From here on, there's no more soldiers. But as long as it's on earth, it's
    still fun!
    Gordon must use the control panel ahead and then go down the elevator. Clear
    the area of aliens and collect any goodies here. In the next room, deal with
    the female assassins. Go up the stairs to the upper tier and go down the
    Destroy any vortiguant soldiers on sight in this hangar. When they are all
    slain, a scientist opens a door for Gordon to get through. He explains that he
    waited for Gordon to clear the area and that all other entrances are locked
    down to fend off the alien invasion. Most of the other team has retreated to
    the core and to other safe areas. The Lambda team is waiting for him. Gordon
    should go to the locked door to have the scientist open it for him. Collect the
    crossbow bolts and go up the elevator, using the charging stations nearby. Go
    right and collect the gluon gun. The scientist nearby is the one who invented
    it, but gives it to Gordon because he is a pacifist. If necessary, Gordon can
    open the target areas to test out his new toy. Grab the energy cells and go to
    the elevator.
    Down, some aliens have already invaded the Lambda reactor! Kill any of them and
    go to where two vortiguant slaves are observing a corpse. Kill the pair and go
    right. A guard is waiting. It is not necessary to use him, but if it makes
    Gordon comfortable to have company, then be my guest. Down the stairs is a
    scientist, who says that the only way up towards the central Lambda Core is to
    flood the reactor by turning on the pumps. There, use the charging stations and
    collect the supplies. Go back up and follow the blue trail on the walls. This
    leads to the first pump. There, a vortiguant slave ambushes behind Gordon
    somewhere along the run. In the room, destroy any vortiguant soldiers and
    collect any supplies. Go up the ladder and through the door. There, avoid the
    headcrabs and turn the wheel on the generator. Go back to the central area. The
    second pump is leaded by the orange trail. Treat this like the first pump,
    except that there's more enemies there and some barnacles. Also, a part of the
    catwalk will collapse. When both pumps are activated, go back to the supply
    room. The scientist tells that both pumps are on and that Gordon must hurry to
    the reactor. Take any leftover supplies. Go to the other passage and fight any
    aliens that get in the way. In the room, an infinite number of vortiguant
    grunts spawn here, so fend off enough to jump into the pool and swim through
    the hole.
    Flood one pump at a time. Only do the next one when the first is finished, or
    else the pumps won't work and it's game over for Gordon! With the water level
    high, Gordon can climb the ladder. Note that the reactor explodes and emits a
    crazy electrical beam. Avoid it and get through the vortiguant slaves to the
    top. Go into the supply room and then go up the elevator shaft climbing the
    ladder to the upper level. There, go into the security booth and tell the guard
    to follow. In a dead-end, Gordon can see how the G-man can get along with dead-
    ends. There's a wheel that will turn on the steam where Gordon can lure Aliens
    and kill them with the steam, saving ammo if needed, but don't kill the guard
    with that! Kill any aliens that spawn and go to the next area. This place has
    teleports everywhere! The more coloured teleport spheres are the entrances,
    while the more pale ones are the exits. Go into the entrance (when a rotating
    platform is under the exit) and be prepared for a little mini-game! The
    entrances that are required for Gordon to go through is 2,4, and 7. Avoid
    going through 1,6, and 9, 1 teleports Gordon in a headcrab field. 6
    transferes Gordon to a fall, taking some of his health away. 9 kills him
    completely. The others load Gordon to rooms with ammo, so go to those ones if
    When Gordon goes through the final teleport, he spawns in a chamber where he
    needs to activate two switches to get to the centre and teleport out. Go for
    switch one first, because when turns on the two, that's the angle where he
    needs to teleport. If he does it the other way around, he'll need to start all
    over again. To get from switch to switch, jump across the rotating platforms
    and back. Don't fall into the anthrax. When Gordon teleports, he appears above
    the teleporting machine. Go to the door. Climb the ladders and such, collecting
    supplies along the way. When up the final ladder, Gordon will come across the
    entrance to the central Lambda core! On the other side of the door, Dr. Kleiner
    and a guard are surprised by Gordon's arrival. Kleiner opens the door for him
    to get through.
    Kleiner explains that single creature is responsible for teleporting aliens to
    Earth. To stop the invasion, Gordon must travel to the alien's dimension, Xen,
    and bring the creature to justice. He also says that his colleague is working
    on the teleport in the next room and will transport Gordon to the borderworld.
    He then gives Gordon a long-jump module, where he can jump at great distances.
    Collect the supplies and the long-jump pack, and get the guard to follow.
    Kleiner can also follow. Use the charging stations and go to the next room.
    Kleiner's buddy is using the controls and needs to be covered to open the
    portal. Don't let him perish, or else it's the end of the game! Go up the
    ladder at the other side. There, when the scientist begins activating the
    portal, kill any vortiguant controllers that spawn in the dome. The best
    weapons to take care of these are:
    -Egon cannon.
    When the scientist announces that the teleport is ready and demands Gordon to
    jump through. When he does, a lone soldier busts in...
    4.25 >Xen<
    Nothing I hate more than traveling in Xen. This area has lower gravity than
    Earth's and has LOTS of platforms.
    Gordon starts on one of the many platforms surrounding a huge platform. From
    here, try to jump from platform to platform, until Gordon lands on the main
    one. Among the cracks on the platform's walls is the entrance to the interior.
    Jump in and Gordon will find himself among shallow water and three small
    towers. First, there is a bit of netting surrounding some flying objects. Smash
    it and open the towers. The three pieces will get attracted to the towers, and
    will create a portal in the middle. Jump in!
    4.26 >Gonarch's Lair<
    It keeps getting worse and worse. Now we have awful music on our hands as well
    as the borderworld!
    Once Gonarch (the spider with a huge sack underneath) is in sight, use the MP5
    Grenades, Rocket Launcher, and any other explosive or other powerful weaponry
    against Gonarch. Gonarch will eventually fall back. Do the same here, and don't
    fall into that hole. Pursue Gonarch once more to its lair.
    Fall inside the pit and get all the supplies down there. When Gonarch comes
    down, use everything against him! When Gonarch is killed, fall down, heal in
    the pool, and get down to the teleport.
    4.27 >Interloper<
    Thank heavens the music has stopped! Unfortunately, this chapter is less 
    annoying but more difficult. Survive this!
    Gordon must fight his way to the opposite end of the island. From there, get
    into the cave and kill the Vortigaunt. Heal in the pool, and then fall in the
    hole and hack through the web-things. Crawl through the tunnels and into a cave
    -like area.
    Don't land on the rock in this "room". Jump to the other end of the cave and
    kill any aliens there. Nab the supplies and head up, then through the little
    hole in the wall.
    Destroy the webbing to make the pillar fall. Then get on. Once Gordon steps on
    the pillar, he will be sent flying sky-high. Once the "elevator" is at its
    maximum height, jump from platform to platform until Gordon reaches the
    stationary platform with the supplies and blood on it. When a manta-like
    aircraft appears, jump on it and then jump to the teleporter.
    Walk out of the cave and use the Crossbow to kill the two Vortigaunt Soldiers
    on the hills. Get into the other cave to find some angry Vortigaunts and
    Supplies. Get out to find some Vortigaunt Controllers.
    Get into the huge hole in the wall and plant some Tripmines on the narrow path.
    This will get the attention of a Gargantua, so run away and plant some Satchel
    Charges. These and the Tripmines will be able to destroy the Garg. To the right
    is a cave with a Battery and some Snarks. To the left is an outdoor area with
    Tentacles (from the Blast Pit level) that make the narrow path dangerous to
    cross. Use Grenades to distract it and keep long jumping to the other end of
    the pathway. Kill the two Alien Grunts and move into the teleporter.
    Gordon will find himself in a factory. Move up the elevators, killing any
    aliens in the way. There will be healing rooms on some of the floors. Notice
    the conveyor belts carrying the huge barrels. Get onto the one that sends the
    barrels down.
    Get out of the pool ASAP. The aliens will notice Gordon's Presence. Don't
    destroy any of the barrels (they contain Vortigaunt Soldiers). Near the pool,
    climb up the tiny platform to get to the next floor. Run towards the conveyor
    belts and get through the narrow passage.
    Move on towards the next elevator. Destroy the barrel and kill the Soldier
    inside. Avoid destroying the rest of the barrels in this area. However, the
    barrels in the next narrow corridor will need to be destroyed, so plant the
    Tripmines near the barrels and then throw a grenade. Collect the supplies near
    the dead body after killing the aliens in the next area. Replenish some lost
    health and then crawl through the small holes.
    Keep crawling through and be ready to slaughter the aliens in the next huge
    room. Go up the ramps and get onto the nearest elevator. On this floor, Gordon
    can go through the holes in the walls to find some supplies. Keep moving up the
    platforms in the previous room until Gordon can jump into that floating portal.
    4.28 >Nihilanth<
    Here's the final boss! The most annoying part in this chapter is that the alien
    can teleport Gordon to rooms. These rooms are very tall and Gordon must climb
    up the platforms on the walls to get back.
    Jump across the platforms and jump into the portal on the throne. Here, try to
    destroy the nearest Orange Crystal in sight (these three need to be destroyed).
    Also, make sure Gordon gets attacked by Nihilanth 2 times with the portal so
    that he won't have to do that again. 
    One of the teleportation’s requires Gordon to jump across the platforms until
    he reaches the portal. Another requires Gordon to kill all the enemies and
    climb aboard a ball that floats to the return portal. However, this can be
    avoided by taking cover behind a pillar (or the portals can be shot). This is
    also how Gordon can avoid taking too much damage from this alien's electric
    Once all of the crystals are destroyed, try to get to the top balcony. To get
    there, Gordon must find the jump pad nearest to the tallest balcony. Jump in
    order to actually make it there. Unfortunately, Nihilanth will teleport Gordon
    once again. In this room, be sure to kill the Ichthyosaur, then get back up and
    kill the Vortigaunts. Search the place for any necessary supplies, then use the
    centre jump pad to get back to business! Repeat this process and kill the Garg
    in the next teleportation.
    Once Gordon's up at the top for the THIRD TIME, fire at Nihilanth. His head
    will open, so fire anything in there! He'll explode, and Gordon will be
    teleported somewhere else.
    4.29 >Conclusion<
    Congrats! The game is now complete! This is the ending! Save before the fork in
    the road to be able to get BOTH endings!
    The G-man has stripped Gordon of his weapons, but has allowed him to keep his
    H.E.V suit. He says that Xen is now free of Nihilanth's influence because of
    Gordon and praises him. He explains why he is with him; the G-man told his
    employers everything and are interested in hiring him and his potential. Here's
    where it gets more detailed. The G-man offers Gordon a choice: Either step into
    the portal and get the job, or wait and die on Xen without defences. Save at
    this point to get both endings!
    It's the end!
    5.0 >Other<
    This covers all the other things in this guide.
    5.1 >Cheats<
    This is the list of cheats available in this game. To access the console, go to
    the options menu, go to the keyboard section, find "advanced", then allow access
    to the console. Press ~ to go to the console (please note that the console
    needs to be enabled via the options menu in order to get to it). Then type
    "sv_cheats 1". Then the rest is history! Note that when creating extra
    monsters, it will only work if there are other monsters like the one being
    given in the map (Barney can't be fighting Nihalanth). Also, noclip mode MUST
    be activated in order to move out of the monster (the monster will appear on
    Gordon's location).
    A special note on cheats for Half-Life that doesn't use Steam by Aaron
    "clarince63" Reis:
    "The easiest way to enable the console is to first, copy the shortcut you use
    to start the game and edit that to enable the console automatically when you
    start the game with that special shortcut. So after you copy the shortcut
    right-click it and go to 'Properties'. And in the 'Target' area (after
    hl.exe), one space then enter the following:
    -console –dev
    And then proceed to run the game and go into the console and enable cheats and
    whatever else."
    "Give" List:
    "Changelevel" List:
    Impulse List:
    76: Spawns a human grunt.
    101: Gives all weapons and ammo.
    102: Spawns gibs.
    103: Displays current monster stats.
    104: Lists global entities.
    105: Silent walk.
    106: Displays current item stats.
    107: Displays current texture name.
    109: Controls onscreen monsters.
    195: Displays AI information.
    202: Creates blood.
    203: Delete monster.
    Other Cheats List:
    noclip: Fly through the air and walls.
    god: Invincibility.
    notarget: Invisibility.
    thirdperson: Third-person view from the right.
    chase_active 1: Third-person view from the back. Change 1 back to 0 to
    deactivate cheat.
    sv_gravity #: Set gravity level. Earth is 800. Numbers are from 0-999.
    5.2 >G-man Sightings<
    These are where the G-man appears.
    Black Mesa Inbound:
    Near the end of the tram ride, the G-man is located at another tram beside
    Anomalous Materials:
    The G-man is arguing with another scientist inside a room towards the Research
    Unforeseen Consequences:
    He is on a catwalk above in a hallway.
    Office Complex:
    He is on the other side of the final locked door, above the zombie filled
    We've Got Hostiles:
    Right before the first soldier, he is on another catwalk above some boxes and
    Power Up:
    Just when the chapter starts, he is at the power control room while some
    soldiers are fighting a Gargantua.
    On yet another catwalk, where the pumps are.
    Lambda Core:
    The final appearance before the ending, he uses teleports to get to places.
    5.3 >Mod List<
    There are many mods for Half-Life, but I will only name a few that I recommend.
    Azure Sheep: A mod which puts the player into the role of Barney Miller. A
    great alternative to Blue Shift.
    Half-Life: Visitors: A game where a lawyer, Alan Green, goes to Black Mesa to
    inspect the safety issues. After the disaster, Alan Green ventures throughout
    to see the Military Fighting the Black Ops. A fantastic game for anarchy fans.
    Life's End: Wacky this mod is, Luther Johnson's adventures are full of
    surprises and gas-induced hallucinations. Very funny.
    Point of View: Xont, a Vortiguant slave, tries to retrieve an important item
    back to Nililanth. A very interesting game, gives an idea from the vortiguants.
    Poke 646: In this mod, a scientist tries to fight his way out of trouble in the
    aftermath of the Black Mesa Incident. The graphics in this game are quite
    comparable to the graphics of Half-Life 2.
    Scientist Slaughterhouse: For those who have supreme anger problems or like
    seeing people die in ridiculous ways, download this mod! There's millions
    of ways to kill Scientists, including imploding, squishing, or even sending
    them off the plank!
    Sven Coop: Ever wanted to play Half-Life co-operatively? Then be sure to play
    this mod! Fight with allies around the world against all odds!
    Sweet Half-Life: Gordon Mickenley was once a warehouse manager, but now he's in
    for the greatest adventure of his lifetime! There's new weapons, sounds, and
    even enemies present! Will the beings of Xen and Earth unite against this
    mysterious army, or will the universe be victim to domination?
    There are also two official Mods available, free for everyone who has Steam,
    and are also available for retail.
    Opposing Force: Corporal Adrian Shepard needs to regroup with his allies for
    extraction! He fights along with his soldiers, and encounters the Black Ops,
    who are planning to nuke Black Mesa! The origin of the Female Assassins are
    revealed, as are a secret race too crazy to mention!
    Blue Shift: Barney Calhoun, a security guard, is on a mission to rescue some
    scientists and to get out of Black Mesa alive! Featuring different areas and
    quite a few easter eggs in this game! Keep the eyes out for Dr. Rosenburg...
    5.4 >FAQ<
    Here's the usual Frequently Asked Questions section!
    Q: I don't know how to get past the first Xen level!
    A: At the centre of the "main" platform, there are these three posts to open.
    After that, smash the box containing these little "fluffs" and that will
    eventually open a portal!
    Q: Should I get Half-Life Source?
    A: No. The models are NOT improved to Half-Life 2's standards, and only the
    physics and water display is improved.
    Q: How does Freeman get the M16?
    A: The High Definition Pack MUST be installed to get the M16. Note that the M16
    will replace the MP5.
    Q: How is the Long Jump performed?
    A: While running, crouch, then quickly jump to perform the Long Jump. This
    requires the Long Jump module, and it takes practice to perform.
    Q: The game automatically quits whenever the game loads between two different
    A: As a temporary cure, arm the crowbar and swing it until the loading is
    finished. I don't know how to cure the problem permanently though. I don't run
    into that problem anymore, maybe it's due to the video display type.
    Q: Cheats don't work!
    A: BEFORE loading a game or starting a new one, open the console and then enter
    "sv_cheats 1". If this is done AFTER starting a game, re-load the game. "Give"
    cheats will only work if Gordon goes through another loading screen.
    Q: What's your Steam account name?
    A: My Steam Account can be found here:
    My Steam nickname is RainingMetal. Be sure to email me if you plan to be
    friends with me!
    Q: I only want to get a certain part of this guide! What can I do?
    A: Select what's necessary and then right click and click on copy (or select
    and then press control C). Then go to some other word document, right click,
    and paste (or press control V). Print away!
    Q: I want to contribute to this guide by writing some information for it!
    A: Go right ahead. E-mail me at Boocatcher5@hotmail.com.
    Be free to e-mail me some more questions. Rules for it are explained below.
    5.5 >Email Guide<
    Here are some ground rules for making e-mails.
    1. Spam is stupid. Never EVER write that kind of stuff.
    2. Spell correctly with good grammar.
    3. Don’t ask something that’s already inside this guide.
    4. Try to make your strategy neat, because I will directly take your strategy
    from your E-mail. Also, pressing enter at the end of each line would help.
    5. Don’t forget about the subject (Half-Life)! Then I will know what the
    topic is about.
    6. Don't ever try to contact me through a messenger program. Ever.
    7. If there's an error or a vital note for the guide missing, please inform me
    of it immediately.
    8. If you're going to criticize my guide, please leave some constructive
    criticism, instead of a death threat (if you leave a death threat, I will block
    Just give me these things if you want to contact me about the guide.
    1. Strategies on incomplete stuff.
    2. Additional FAQs.
    3. Notable glitches.
    4. Other stuff to make this guide interesting.
    6.0 >And the Rest!<
    This is the last chapter of this guide. I hope you enjoyed it!
    6.1 >Website List<
    This is a list of the Websites that this guide is available to:
    6.2 >Credits<
    -Me, the author.
    -Valve & Sierra, for making the game.
    -Dch48 nick, for the Surface Tension Helicopter note.
    -clarince63for the console information for Half-Life that doesn't
    run on Steam, along with making some corrections with the guide.
    -GameFAQs for uploading this guide.
    6.3 >Legal Disclaimer<
    Copyright 2011 Brett Sim
    This may be not rewritten under any circumstances except for personal, private
    use. It may not be placed on any web site or otherwise distributed publicly
    without permission before so. Use of this guide on any other web site or as a
    part of any public display is strictly, indisputably prohibited, and a
    violation of copyright.
    Failure to comply with the above terms can result in a lawsuit.
    All trademarks and copyrights contained in this document are owned by their
    respective trademark and copyright holders.
    If you wish to get some information from this guide, they must be confirmed and
    chosen by the author, Raining Metal.
    If you do not agree with the terms here, you should not use this guide any
    Thank You.