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    FAQ/Walkthrough by MGreen

    Version: 1.0 | Updated: 10/12/07 | Printable Version | Search Guide | Bookmark Guide

    This is the Portal FAQ v1.0
    By Mark Green
    Email address for submissions/comments:
      mark [at] antelope [dot] nildram [dot] co [dot] uk
    
    The latest version of this FAQ will always be available from
    http://www.gamefaqs.com.
    
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    Neither the author of this FAQ, nor any person who distributes it in
    any way, shall be responsible or liable for anything that results from
    using this FAQ for any purpose, including but not limited to damage to
    your PC, hands, eyes, or sanity.
    
    This FAQ may be freely distributed provided that it is kept unmodified
    and in its entirity.  If the FAQ is distributed in a form where it can
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    up-to-date with the latest version.  This FAQ may not be sold, or
    included as part of a publication that is sold (including a website to
    which a subscription is charged), without the author's express
    permission, which can be requested only by e-mail to the address
    above.
    
    Portal is (c) Valve Software.  The use of any trademarks within
    this FAQ is not intended to represent a challenge to their validity.
    
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    INTRODUCTION ---------------------------------------------------------
    
    Portal is a Half-Life 2 engine game designed as a showcase for an
    innovative game mechanic: the portal gun.  Portal is available at
    retail as part of the "Orange Box" compilation, or it can also be
    bought on its own from Steam for US$19.99.
    
    Portal is actually an updated version of an older game called
    "Narbacular Drop", which is available for free.  Narbacular Drop has
    far fewer levels, and much worse graphics, and some exploits that
    work in Narbacular Drop don't work in portal.
    
    ======================================================================
    GAME MECHANICS =======================================================
    ======================================================================
    
    PORTALS.  If you don't get these, you're going to be in trouble.
    There are two, the blue portal and the yellow portal.  Go through the
    blue portal and you come out of the yellow portal, and vice versa.
    If only one of the portals is active, it'll be all cloudy indicating
    that it can't be used because it has no other end.  The two portals
    exist in exactly the same map - there's no "multi-dimensional" thing
    going on.  There are all kinds of funky things to learn about portals,
    but you'll learn most of them by playing the game, so I won't explain
    them here.
    
    METAL.  Walls and floors can be made out of it.  If they are, you
    can't put portals on them.  Bummer.
    
    BUTTONS.  All buttons are red.  Some buttons are small, and you can
    press them yourself with the USE key, whereupon they'll activate
    something.  Usually, the button will reset after a while and the
    thing it activated will shut down.  Other button are large, and you
    can activate them by standing on them, but usually this will be no
    use because you will need to be somewhere else to interact with the
    thing the button's connected to.  The solution is to pick up a..
    
    CUBE.  Handy little things which you drop on big buttons to hold them
    down.  You can use them for other purposes too.  Cubes can be
    destroyed.  If a cube is destroyed, you'll usually be given another
    one at the point where you collected the cube from originally.
    
    EMITTERS, PELLETS, RECIEVERS.  Emitters occasionally shoot energy
    pellets.  If an energy pellet hits a reciever, it activates something
    (permanently).  If an energy pellet hits you, you die.  If an energy
    pellet hits anything else (such as a wall, or a cube) it bounces off,
    and will continue bouncing for a finite time before it explodes.  The
    emitters are very waste-conscious; they will not shoot another energy
    pellet while one is already in the air (but if there are two emitters,
    each one can have a pellet in the air) and they will stop shooting
    altogether when all tasks requiring energy on a map have been
    completed.
    
    KILLER FLOOR.  Also known as goo.  It's on the floor.  It kills you.
    Any questions?
    
    TURRETS.  Ok, I'll be a bit less facetious about these guys, since
    they're quite interesting.  Essentially, they sit there looking in
    one direction (you can see their red scan beam emitted in that
    direction, but their field of vision is actually about a 45 degree
    cone with the beam in the centre). If they see you, they activate
    and start shooting you with their machine guns.  Glass, walls, or
    cubes will block the guns (glass will be cracked, but won't break).
    They continue firing until you're dead or you move out of the way.
    Damage in Portal is a bit odd - essentially, if you get shot too much
    you're dead, but there is no LASTING damage.  You can get shot a
    little bit by every turret on a map and you'll live, but if one of
    them shoots you too much, you'll die.  Assuming you move out of the
    way, they'll search for you for a moment, then shut back down again.
    And they have cool sing-song computer voices and they're
    magnificiently creepy.  How do you defeat them?  It's actually easy.
    You just push them over (!) from the side.  You can also drop them
    into portals if you like - anything that makes them fall over.  The
    only kicker is that when they are shooting you, their shots knock you
    back, so you can't simply approach them and tip them from the front.
    But since you have portals, approaching them from another direction
    can't be too difficult, can it?  By the way, turrets are smart and
    recognise other turrets, so they won't start shooting when they see
    one.  But you CAN make them shoot at another turret by dodging out
    of the way carefully, and you CAN make them fall on each other.
    
    ROCKET TURRETS.  Not the same as the regular turrets.  These guys
    move through a full 360 degree fire arc, but they move really
    slowly.  If they see you, they'll pause for a good second before
    firing a rocket at you.  In that second, you want to get out of the
    way.  Seriously.  One rocket hit equals death.  Rocket turrets cannot
    be defeated or destroyed - even if you trick them into shooting
    themselves, even a rocket hit does not kill them.  They can, however,
    be mercilessly exploited, as we shall see.
    
    ======================================================================
    MAIN GAME WALKTHROUGH ================================================
    ======================================================================
    
    The walkthrough is broken down with the following section headers, 
    which you can search for (turn on case sensitivity):
    
    PRELUDE
    TEST 1
    TEST 2
    TEST 3
    TEST 4
    TEST 5
    TEST 6
    TEST 7
    TEST 8
    TEST 9
    TEST 10
    TEST 11
    TEST 12
    TEST 13
    TEST 14
    TEST 15
    TEST 16
    TEST 17
    TEST 18
    TEST 19
    THE CAKE
    GLADOS
    
    PRELUDE --------------------------------------------------------------
    "Hello and again welcome to the Aparture Science Computer Aided
    Enrichment Centre.  We hope your brief detention in the relaxation
    vault has been a pleasant one.  Your specimen has been processed and
    we are now ready to begin the test proper.  Before we start, however,
    keep in mind that although fun and learning are the primary goals of
    all Enrichment Centre activities, serious injuries may occur.  For
    your own safety and the safety of others, please refrain from
    *static*.. and back.  The portal will open in 3, 2, 1.."
    
    [Note: the music you hear on the radio here is actually the ending
    song, in a different form.]
    
    1. Walk through the yellow portal and around the cell into the next
    room.
    
    2. Pick up the cube and drop it on the button.
    
    "Excellent.  Please proceed into the chamber lock after completing
    each test.  First, however, note the incandescent particle field
    across the exit.  This Apature Science Material Emancipation grid
    will vapourise any unauthorised equipment that passes through it; for
    instance, the Apature Science Weighted Storage Cube."
    
    3. Walk through and get in the lift.
    
    TEST 1 ---------------------------------------------------------------
    "Please place the Weighted Storage Cube on the 15 hundred megawatt
    Aperture Science Heavy Duty Supercolliding Superbutton."
    
    1.  Fall down from the entrance platform and turn 180 degrees to find
    the yellow portal.  Wait for the yellow portal to change to the cube
    chamber.  Go through the yellow portal and pick up the cube, then
    return through the blue portal (if it has disappeared, wait for it to
    reapper).
    
    2.  Wait for the yellow portal to change to the button chamber, then
    go through the yellow portal and drop the cube on the button.
    
    "Perfect.  Please move quickly to the chamber lock as the effects of
    prolonged exposure to the button are not part of this test."
    
    3.  Return through the blue portal, then wait for the yellow portal
    to change to the exit gate.  Walk through and get in the lift.
    
    TEST 2 ---------------------------------------------------------------
    "You're doing very well.  Please be advised that a noticable taste of
    blood is not part of any test protocol, but it is an unintended side
    effect of the Aperture Science Bacterial Emancipation Grid, which may,
    in semi-rare cases, emancipate dental fillings, crowns, enamel, and
    teeth."
    
    1.  Pass through the door and down the stairs, then wait for the blue
    portal (it may take a while).  Pass through it and fall down, then
    get the portal gun.
    
    "Very good.  You are now in possession of the Aperture Science
    Handheld Portal Device.  With it, you can create your own portals.
    These intradimensional gates have proven to be completely safe.  The
    Device, however, has not.  Do not touch the operational end of the
    device.  Do not look directly at the operational end of the device.
    Do not submerge the device in liquid, even partially.  Most
    importantly, under no circumstances should *static*."
    
    2.  Place the blue portal on any wall and walk through it to the exit
    door, then pass through and get in the lift.
    
    TEST 3 ---------------------------------------------------------------
    "Please proceed to the chamber lock.  Mind the gap."
    
    *  Shoot any portal onto the wall behind the security camera, while
    the other portal is open, to destroy the camera.  You can destroy any
    camera in the game this way.  You don't ever have to do this, but
    destroying them all gets you the Camera Shy achievement.  From now on
    I will only mention the locations of security cameras.
    
    1.  Shoot a blue portal onto any wall and pass through it to cross the
    first gap.
    
    2.  Shoot a blue portal onto the wall across the second gap, then pass
    through the yellow portal to cross the second gap.  Get in the lift.
    
    "Well done.  Remember, the Aperture Science Bring your Daughter To
    Work Day is the perfect time to have her tested."
    
    TEST 4 ---------------------------------------------------------------
    "Welcome to Test Chamber 4.  You're doing quite well."
    
    *  Security Camera.  "To ensure the safe performance of all authorised
    activities, do not destroy vital testing apparatus."
    
    1.  Shoot a blue portal onto the floor underneath the cube dropper
    (you can wait for a cube to fall first if you like and then aim under
    it).
    
    2.  Collect the cube from the yellow portal and drop it on the button.
    
    "Once again, excellent work.  As part of our required test protocol,
    we will not monitor the next test chamber.  You will be entirely on
    your own.  Good luck."
    
    *  Security camera. "For your own safety, do not destroy vital testing
    apparatus."
    
    3.  Get in the lift.
    
    TEST 5 ---------------------------------------------------------------
    1.  Go to the pit at the back of the room and shoot a blue portal
    under the cube.
    
    2.  Shoot the blue portal onto any wall and pass through.  Get the
    cube and drop it onto one of the buttons.
    
    3.  Pass through the blue portal again onto the upper platform.
    
    *  Security camera on the wall to your right.  "Certain objects may be
    vital to your success.  Do not destroy testing apparatus."
    
    4.  Shoot the blue portal onto the wall behind the opposite platform,
    then pass through the yellow portal.  Get the cube and drop it onto
    the other button.  Go through the opened gate.
    
    "As part of a required test protocol, our previous statement
    suggesting that we would not monitor this chamber was an outright
    fabrication.  Good job.  As part of a required test protocol, we will
    stop enhancing the truth in 3... 2... *static*"
    
    5.  Shoot the blue portal onto any wall.  Pass through and get in the
    lift.
    
    TEST 6 ---------------------------------------------------------------
    "While safety is one of many Enrichment Centre goals, the Aperture
    Science High Energy Pellet seen to the left of the chamber can, and
    has, caused permanent disabilities, such as vaporisation.  Please be
    careful."
    
    1.  Shoot the blue portal onto the ceiling above the receptor.  (Note
    the yellow beam indicating a straight line to the receptor.)
    
    "Unbelievable.  You, subject name here, must be the pride of subject
    hometown here."
    
    2.  Go up on the elevator platform and get in the lift.
    
    TEST 7 ---------------------------------------------------------------
    "Warning devices are required on all mobile equipment.  However,
    alarms and flashing hazard lights have been found to agitate the High
    Energy Pellet and have therefore been disabled for your safety."
    
    1.  Shoot the blue portal onto the wall opposite the emitter.  (Note
    the burn mark on the wall where the energy pellet is hitting it.)
    
    "Good.  Now use the Aperture Science un-stationary scaffold to reach
    the chamber lock."
    
    2.  When the moving platform is at the maximum left side, shoot the
    blue portal onto the ceiling above it, then drop through the yellow
    portal onto it (you can look through the portal to get your timing
    right).  Ride the portal to the exit gate and get in the lift.
    
    TEST 8 ---------------------------------------------------------------
    "Please note that we have added a consequence for failure.  Any
    contact with the chamber floor will result in an unsatisfactory mark
    on your official testing record, followed by death.  Good luck."
    
    1.  Wait for the yellow portal to open.  Shoot the blue portal onto
    the wall opposite the emitter (where the burn mark is).
    
    2.  Wait for the Pellet to pass through the portal.  Once it is
    moving from side to side in front of you, shoot the blue portal onto
    the wall opposite the reciever (where the light is).
    
    (If the pellet explodes halfway through, try again but be faster! :)
    
    3.  Shoot the blue portal onto the wall at the end of the platform
    where you are, and step through it onto the inner platform.
    
    4.  Shoot the blue portal onto the wall behind where the moving
    platform stops, and step through the yellow platform onto it.  Ride
    the moving platform to the end and get in the lift.
    
    "Very impressive.  Please note that any appearance of danger is
    merely a device to enhance your testing experience."
    
    TEST 9 ---------------------------------------------------------------
    "The Enrichment Centre regrets to inform you that this next test is
    impossible.  Make no attempt to solve it.  The Enrichment Centre
    apologises for this clearly broken test chamber.  Once again, the
    Enrichment Centre offers its most sincere apology on the occasion of
    this unsolvable test environment.  Frankly, this chamber was a
    mistake.  If we were you we would quit now."
    
    1.  Yea, right!  Shoot the blue portal onto the floor underneath the
    cube.  Let the cube fall through and then pass through yourself.
    
    2.  Shoot the blue portal through the hole in the wall above the force
    field to the distant side of the walled-off chamber, then pick up
    the cube and walk through the yellow portal.
    
    3.  Drop the cube on the button and get in the lift.
    
    "Fantastic.  You remained resolute and resourceful in an atmosphere of
    extreme pessimism."
    
    TEST 10 --------------------------------------------------------------
    "Hello again.  To reiterate *static* previous request *static* of
    momentum."
    
    1.  Wait for the yellow portal to appear on the wall above and behind
    you, then shoot the floor with the blue portal and jump (don't just
    fall) in.  Climb the stairs and enter the next room.
    
    2.  Wait for the yellow portal to appear on the wall above and behind
    you, then shoot the floor at the bottom of the pit with the blue
    portal, jump, and fall all the way in.  Once over the pit, enter the
    next room.
    
    "Spectacular.  You appear to understand how a portal affects forward
    momentum, or to be more precise, how it does not."
    
    3.  Shoot the blue portal onto the wall above and behind you, then
    jump and fall into the yellow portal.  You should land on the
    platform with a marker tile with 2 circles on it.
    
    "Momentum, a function of mass and velocity, is conserved between
    portals.  In layman's terms, speedy thing goes in, speedy thing
    comes out."
    
    4.  Wait for the wall above where you previously were to move forward,
    then shoot the blue portal onto it and jump and fall again into the
    yellow portal.  Get in the lift.
    
    TEST 11 --------------------------------------------------------------
    "The Enrichment Centre promises to always a safe testing environment.
    In dangerous testing environments, the Enrichment Centre promises to
    always provide useful advice.  For instance: 'The floor here will
    kill you.  Try to avoid it.'"
    
    * Security Camera on the wall behind you as you come in. "Vital
    testing apparatus destroyed." (This is repeated for every camera from
    now on.)
    
    1.  Shoot the blue portal onto any wall.  Wait for the portal to
    change to a platform where it's safe to walk, then pass through and
    press the red button.  It opens a door on the opposite wall; quickly
    shoot the blue portal through it onto the far wall of the chamber
    within.
    
    2.  Wait for the yellow portal to reappear behind you and pass through
    it.
    
    3.  Look through the large window.  When the yellow portal is about to
    be opposite the reciever, shoot the blue portal opposite the emitter
    in this room (look for the burn mark).  Remember to allow time for the
    pellet to get to the portal - shoot as early as you can.
    
    4.  Shoot the blue portal onto any wall.  Wait for the portal to
    change to the moving platform, then walk through and get on it.  Ride
    the moving platform to the centre of the room and get the upgraded
    portal gun.
    
    "The Device has been modified so that it can now manufacture two
    linked portals at once.  As part of an optional test protocol, we are
    pleased to present an amusing fact: the device is now more valuable
    than the organs, and combined incomes, of everyone in subject hometown
    here."
    
    5.  Press the red button that appears when you get the upgraded portal
    gun, and shoot the blue portal through it at the far wall.  Get back
    on the moving platform and ride it to the yellow portal, then pass
    through.  Get in the lift.
    
    TEST 12 --------------------------------------------------------------
    "*static* fling yourself.  *static* fling into spa- *static*."
    
    1.  Shoot a blue portal at the wall opposite you over the pit, and a
    yellow portal into the bottom of the pit.  Jump and fall through
    the yellow portal and use momentum to reach the platform above your
    original location, with a two-dot marker.
    
    2.  Shoot the blue portal onto the wall further above and further
    forward of the previous one, then repeat the jump and fall to land
    on the platform with a three-dot marker.
    
    3.  Shoot the blue portal onto the wall behind the red button, that
    is angled at 45 degrees, and repeat the jump and fall through the
    yellow platform to land on the platform with a cube.
    
    4.  Get the cube, jump down (no need to portal) and put the cube on
    the button.
    
    5.  Repeat the jump and fall to get back to the platform with the
    cube.  Go through the exit gate and get in the lift.
    
    "Wheeeeeeeeeeeeeeeeeeeeee *static*"
    
    TEST 13 --------------------------------------------------------------
    "Now that you are in control of both portals, this next test could
    take a very, very, long time.  If you become light-headed from thirst,
    feel free to pass out.  An intubation associate will be dispatched to
    revive you with peptic salve and adrenaline."
    
    *  Security camera on the wall behind you as you enter.
    
    1.  Shoot the yellow portal onto the wall on the upper floor, behind
    the cube.  Shoot the blue portal onto any wall near you.  Pass
    through, get the cube, fall down with it and put it on the button,
    then pass through again and go through the opened gate.
    
    *  Security camera on the wall behind you as you enter the larger half
    of the chamber.
    
    2.  Shoot the blue portal onto the wall in front of the emitter and
    the yellow portal onto the ceiling in line with the reciever.  Wait
    for a pellet to hit the reciever.
    
    3.  Shoot the blue portal onto the ceiling above the moving platform
    and the yellow platform onto any wall you can reach.  Look through
    the portal to get your timing right to pass through and land on the
    platform.  Get the cube and fall back to the floor.
    
    4.  Shoot the blue portal onto the ceiling above the left-hand button
    (the one with a one-dot marker above it).  Look through the yellow
    portal to check your positioning.  Once done, "post" the cube through
    the yellow portal (you can go through too if you like, but you don't
    have to)
    
    5.  Shoot the blue portal through the high-up gate you came through
    from the first chamber.  Enter the yellow portal to go back to the
    first chamber.  Shoot the blue portal onto any wall you can reach,
    then take the cube off the button and pass through the portal.
    
    6.  Shoot the blue portal onto the ceiling above the other button (the
    one with a two-dot marker above it).  "Post" the cube through the
    yellow portal.  The gate should open.
    
    7.  Shoot the blue portal onto the wall above the gate.  Go through
    the yellow portal, go through the gate and get in the lift.
    
    "As part of a previously mentioned required test protocol, we can no
    longer lie to you.  When the testing is over, you will be.. missed."
    
    TEST 14 --------------------------------------------------------------
    "All subjects intending to handle high energy gamma leaking portal
    technology must be informed that they may be informed of applicable
    regulatory compliance issues.  No further compliance information is
    required or will be provided, and you are an excellent test subject."
    
    1.  As you enter the area, turn left and walk towards the pit.  A
    set of stairs will appear.  Climb it.
    
    2.  Shoot the blue portal onto the wall opposite where the cube is.
    Wait for the staircase to disappear, then shoot the yellow portal
    onto the floor where it used to be, and jump from the upper platform
    into the yellow portal to fling yourself to the cube.
    
    3.  Get the cube and put it on the button.  Turn back and shoot the
    yellow portal onto the ceiling above the reciever on the upper
    level.
    
    4.  Pass through the gate that the button opened and jump across the
    moving platforms (old school!)  Once you get to the other side, shoot
    the blue portal onto the wall opposite the emitter and wait for the
    pellet to hit the reciever.
    
    "Very, very, good.  A complementary victory lift has been activated
    in the main chamber."
    
    5.  Pass through the blue portal yourself (hey, why not!) to land on
    the reciever (it does you no harm to land on an active reciever) then
    walk to the elevator platform in the main room and get in the lift.
    
    TEST 15 --------------------------------------------------------------
    "The Enrichment Center is committed to the well-being of all
    participants.  Cake, and grief counselling will be available at the
    conclusion of the test.  Thank you for helping us help you help us
    all."
    
    *  Security camera on the wall behind you as you enter.
    
    1.  Shoot the blue portal onto the extruded wall above and behind you
    as you enter.  Shoot the yellow portal onto the floor and jump into
    it.  As you fall, shoot the yellow portal onto the floor again at
    the point where you are about to land.  Keep doing this until you are
    flung through the force field.  Move into the next room.
    
    *  Security camera on the wall behind you as you enter.
    
    2.  Shoot the blue portal onto the wall opposite the emitter and the
    yellow portal onto the wall anywhere opposite the chamber with the
    reciever in it.  Wait for the pellet to pass through the portal,
    and then quickly pass through the force field before the pellet
    passes back through the portal. (Passing through a force field
    destroys all your portals.)
    
    3.  Quickly place the blue portal on the wall where the pellet hit
    (look for the burn mark) and the yellow portal on the ceiling above
    the reciever.  Wait for the pellet to hit the reciever.  Get on
    the elevator platform and move to the next room.
    
    4.  Shoot the blue portal onto the extruded wall above and behind you
    as you enter.  Facing in the direction that you entered, turn left and
    pass through an arch into a small sub-chamber.
    
    * Security camera on the left hand side of the sub-chamber.
    
    5.  Shoot the yellow portal onto the bottom of the pit in the sub-
    chamber.  Jump and fall through and, just as in step 1, shoot the
    yellow portal onto the floor again when you are just about to land.
    Keep trying steps 4-5 until you are flung through the force field.
    
    6.  In the new area repeat the same process as in step 1 to get
    through the force field.  Take care not to drift to the side or you
    may hit the energy pellet.
    
    7.  Shoot the blue portal onto the wall that the energy pellet is
    hitting AFTER it's bounced off the 45 degree angled wall.  Shoot the
    yellow portal onto the flat wall opposite on the other side of the
    angled wall.  Wait for the pellet to hit the reciever.
    
    8.  Repeat the step 1 process *AGAIN* to get back through the force
    field.
    
    9.  Pass through the arch in this area and use portals to cross the
    backwards moving platforms over the killer floor.  Use the following
    procedure: shoot the blue portal onto the wall facing you at the first
    corner of the passage.  Then shoot the yellow portal onto the outside
    wall, wait for there to be a platform behind the portal and step
    through.  Quickly turn and shoot the blue portal at the facing wall of
    the second corner of the passage and ride the platform back to the
    outside.  Again wait for there to be a platform behind the yellow
    portal and pass through.  Now you should be able to see the room at
    the other end, shoot the blue portal into the room, but do not shoot
    directly forward as a metal portal-proof pillar there blocks you -
    shoot to the side of the pillar.  Then shoot the yellow portal onto
    any wall in the passage and pass through it.
    
    *  Security camera, probably opposite you.
    
    10.  Ride the elevator platform in the far right corner of the room
    up into the chamber there.  Shoot the blue portal onto one of the
    walls of the chamber.  Look across the room at the high-up chamber
    in the opposite corner and shoot the yellow portal there.
    
    11.  Very quickly press the red button in the chamber you're in,
    rush through the blue portal, press the red button in the chamber
    you arrive in, then from the window of the chamber shoot the blue
    portal in front of the emitter and the orange portal in front of
    the reciever.  Wait for the pellet to hit the reciever.  Get on
    the elevator platform and get in the lift.  Phew!
    
    "Did you know, you can donate one or all of your vital organs to the
    Aperture Science Self-Esteem Fund for Girls?  It's true."
    
    TEST 16 --------------------------------------------------------------
    "Due to mandatory scheduled maintenance, the appropriate chamber for
    this testing sequence is currently unavailable.  It has been replaced
    with a live fire course designed for military androids.  The
    Enrichment Centre apologises for the inconvenience and wishes you the
    best of luck."
    
    * Security camera right in front of you as you round the corner.
    
    1.  Push over the turret facing to the left in the first area.
    
    * Security camera right in front of you as you round the corridor
    corner.
    
    2.  Facing the left-hand arch, quickly enter the beam and shoot the
    blue portal onto the wall behind the turret.  Move quickly out of
    the archway before the turret fires.  Shoot the yellow portal onto
    any wall, pass through and push the turret over.
    
    3.  Repeat the same procedure with the turret in the alcove on the
    left hand side of the corridor.  This turret is quicker to fire so it
    may get you once or twice, but you can still shoot a portal behind
    it, then use the opposite portal on any wall to get behind it and
    push it over.
    
    * Security camera above the turret in the alcove.
    
    4.  Hide behind the glass to prevent the next turret shooting you, and
    move until it shuts down.  Then quickly step in front of the glass and
    shoot the blue portal onto the ceiling above the turret (note the
    "X").  Again the turret may tag you, don't worry.  Shoot the yellow
    portal onto the floor.  Pick up one of the cubes and drop it through
    the yellow portal to smack the turret on the head.  DO NOT GO THROUGH
    THE PORTAL YOURSELF or the second turret, opposite, will shred you.
    
    5.  Hug the wall very closely to shoot the blue portal onto the
    ceiling above the second turret (notice another red X).  Drop the
    second cube through the yellow portal and brain the turret.
    
    *  Having moved the two cubes, you can move into the "secret" area
    they were obstructing to see interesting things.  Were those cubes
    even supposed to be here, and part of the test?
    
    6. Once you are sure the turret's dead, pass through the yellow portal
    yourself, and land behind the cube, further into the corner. Crouch
    and push the cube forward, hiding behind it to avoid the next turret's
    fire.  Shoot the blue portal behind the turrets, then hide behind the
    cube and make a quick sprint across the opening back to an area with
    a portal-able floor.  Shoot the yellow portal onto the floor, and fall
    down.  Push over the two turrets.
    
    7. Carefully move across to the side nearest you of the furthest door,
    and shoot the yellow portal onto the X on the ceiling above the
    corner turret, then hide behind the frame before it shoots you.
    Quickly run across the door, then shoot a blue portal UNDERNEATH the
    nearest turret to the door.  Enjoy the hilarious dialog as the turrets
    kill each other ("Aaaaargh!  It's me!  My fault!") and rack up your
    Friendly Fire achievement.
    
    (Also, in this room, if you move carefully before killing any of the
    turrets, you can make the turret in the far right corner shoot the
    turret near the entrance, which makes it shriek "Don't shoot!" :) )
    
    8.  Just for a laugh, let's do it again.  Enter the room and move to
    the right, using the corner to hide from the turret in the far right
    corner.  Shoot the yellow portal onto the X above it.  Now, go to
    the room next door and get a cube to drop on the button and open the
    exit gate (drop the cube quickly to avoid getting shot).  You'll see
    the tell-tale line that says there's another turret beyond the gate.
    Again use the room's internal corner to hide from the turret as you
    move up to the exit gate and shoot the blue portal through the
    gauze wall underneath the turret in the next room.  Whack!
    
    *  Security camera above where the third turret was.
    
    9.  Shoot the yellow portal at any safe wall and pass through.
    
    *  Security camera on the wall of the chamber where the turret was.
    
    10.  Shoot the yellow portal at the wall by the side of the turret in
    the next chamber.  Move to the side of the grille to see the side
    wall.  Shoot the blue portal at any safe wall, pass through, push the
    turret over and get in the lift.
    
    "Well done, android.  The Enrichment Centre once again reminds you
    that android hell is a real place where you will be sent at the first
    sign of defiance."
    
    TEST 17 --------------------------------------------------------------
    "The Vital Apparatus Stand will deliver a Weighted Companion Cube in
    3.. 2.. 1.."
    
    1.  Pick up the cube.
    
    "This Weighted Companion Cube will accompany you through the test
    chamber. Please take care of it."
    
    2.  Use the cube to climb the stairs in the next room.  Drop it on the
    floor, jump on it, jump up onto a stair, then look down from the stair
    and pick the cube up.  Repeat this to climb two stairs.
    
    3.  Pick up the cube and hold it in front of you as you move down the
    tight corridor.  It should deflect any energy pellets fired at you by
    the emitter at the end, although you can crouch behind it to be sure.
    For future reference, this corridor is corridor A.
    
    "The symptoms most commonly produced by Enrichment Centre testing are
    superstition, percieving inanimate objects as alive, and
    hallucinations.  The Enrichment Centre reminds you that the Weighted
    Companion Cube will never threaten to stab you and, in fact, cannot
    speak."
    
    4.  Keep holding the cube towards the emitters as you enter the next
    room.  Wait for the right hand emitter in front of you to actually
    emit a pellet, and then quickly run backwards up the staircase
    opposite it to block the pellet with your Cube.  Walk backwards down
    the corridor, holding the cube in front of you.  (Don't just enter the
    corridor without waiting for a pellet to be emitted first, because
    there may already be a pellet in the corridor that will hit you in the
    back.  If you go down holding the cube forwards, the active pellet may
    expire while you are in the corridor and you will be shot in the back
    by the emitter.)  This corridor is corridor B.
    
    * Security camera on the wall behind you at the end of this corridor.
    
    5.  Fall down from the high platform in the next room.  There is a
    pushed-out wall just behind you as you fall.  Use portals to enter
    it to find a rather disturbing secret area.
    
    6.  Leave the secret area and enter the archway on your left, holding
    the Cube.  Use the cube to deflect the Pellet into the reciever.
    
    * Security camera above the archway.
    
    7.  Use portals to return to the upper ledge where you entered the
    room, and shoot the blue portal onto the wall tilted 45 degrees,
    opposite the reciever.  Shoot the yellow portal onto the wall at the
    end of corridor B, to capture the pellet that was trying to kill you
    earlier.  Wait for the pellet to hit the reciever.
    
    "The Enrichment Centre reminds you that the Weighted Companion Cube
    cannot speak.  In the event that the Weighted Companion Cube DOES
    speak, the Enrichment Centre urges you to disregard its advice."
    
    8.  Walk back to corridor A, and shoot the blue portal onto the very
    end of the corridor (you can do this without entering the corridor),
    again to capture the pellet.  Shoot the yellow portal somewhere
    harmless to keep the pellet out of the way.
    
    9.  Return to the main area and shoot the yellow portal onto the
    pushed out wall (where the secret area was).  Get the Cube. Carefully
    enter the archway opposite the portal (watch out for the pellet).
    Walk to the raised button at the back of the wall and put the cube on
    it, then CAREFULLY stand yourself on the button at the front of the
    room (there is JUST enough space for you to stand on the button
    without the pellet hitting you as it passes).  Let the pellet hit the
    reciever.
    
    10.  Use portals to return to the platform where you came in, making
    sure to take the cube with you.  Jump across the three newly-raised
    platforms, turn right, and jump into the new section.  Drop the
    Cube on the button.
    
    "You did it.  The Weighted Companion Cube certainly brought you good
    luck.  However, it cannot accompany you for the rest of the test and,
    unfortunately, must be euthanised.  Please escort your Companion Cube
    to the Aperture Science Emergency Intelligence Incinerator."
    
    11.  Enter the next area, pass through the open gate and press the
    button to open the incinerator.
    
    "Rest assured that an independant panel of ethicists has absolved the
    Enrichment Centre, Aperture Science employees, and all test subjects
    of any moral responsibility for the Companion Cube euthanising
    process."
    
    (The following five quotes are repeated until the cube is destroyed)
    
    "While it has been a faithful companion, your Companion Cube cannot
    accompany you through the rest of the test.  If it could talk (and
    the Enrichment Centre takes this opportunity to remind you that it
    cannot), it would tell you to go on without it because it would rather
    die in fire than become a burden to you."
    
    "Testing cannot continue until your Companion Cube has been
    incinerated."
    
    "Although the euthanising process is remarkably painful, eight out of
    ten Aperture Science engineers believe that the Companion Cube is
    most likely incapable of feeling much pain."
    
    "The Companion Cube cannot continue through the testing.  State and
    Local Statutory regulations prohibit it from simply remaining here,
    alone and companionless.  You must euthanise it."
    
    "Destroy your Companion Cube or the testing cannot continue."
    
    12.  Sorry... go get the Cube off the button and drop it into the
    incinerator.  Get in the lift. (Not in cruelty, nor in wrath, the
    reaper came today; an angel visited this gray path, and took the cube
    away...)  At least, you get your Fratricide achievement for this.
    
    "You euthanised your faithful Companion Cube more quickly than any
    test subject on record.  Congratulations."
    
    TEST 18 --------------------------------------------------------------
    "The experiment is nearing its conclusion.  The Enrichment Centre is
    required to remind you that you will be baked, and then there will be
    cake."
    
    1.  Place the blue portal on the ceiling opposite the pit and the
    yellow portal on any safe wall, and pass through it.
    
    2.  Crouch under the left-hand wall to look around another secret
    area.
    
    3.  Leaving the secret area, place a blue portal on the highest and
    most distant ceiling and the yellow portal on the wall on the opposite
    side of the pit, slightly below you.  Jump across the pit and into the
    yellow portal.
    
    4.  Shoot the blue portal on the ceiling above the three-dot platform
    and the yellow portal onto the floor, then fall through.
    
    5.  Repeat the same process to reach the four-dot platform, except
    this time shoot the blue portal onto the wall above it.
    
    6.  Use the "fling" technique to reach the opposite platform.  Shoot
    the blue portal onto the pushed-out wall above you, the yellow portal
    onto the platform below you as you look over the edge of the platform
    you're on, then jump and fall into the yellow portal.
    
    7.  Press the red button in this chamber and pass through the opened
    wall.
    
    8.  Destroy the four turrets in this room by using the portals to
    redirect the energy pellets to hit them.  The pellet emitter in the
    centre of the room rotates between four directions firing a pellet
    each time.  It can be difficult to line up the portals with the
    turrets, so you'll just have to use trial and error, I'm afraid.
    
    9.  Shoot the blue portal onto one of the burn marks where the
    launched pellets are hitting the wall, and the yellow portal onto the
    extruded wall at the far end of the chamber.  Wait for a pellet to
    pass through the blue portal and then VERY QUICKLY shoot the blue
    portal onto the 90-degree rotated wall on the left hand side, then
    shoot the yellow portal onto a safe wall, and jump through the yellow
    portal to hit the raised button.  The aim here is to press the button
    (thus opening the door to the reciever) just before the pellet arrives
    at the reciever, because the door does not stay open very long.
    
    10.  Get on the moving platform and ride across to the other side of
    the room.  The jump to the platform with the cube on it is impossible
    from here, so just jump and fall into the lower area.  Shoot the blue
    portal onto any safe wall on the side where you started EXCEPT the
    moving wall section you came in by (look for the blue connecting line)
    and the yellow portal onto any safe wall in the current chamber.
    Press the button to make the wall you came in by re-open, then quickly
    head through the yellow portal to the other side.  Once the opening
    wall turns 45 degrees, place the blue portal on it, then head to the
    right hand side of the platform you're on and place the yellow portal
    on the safe floor below, then jump into the yellow portal to "fling"
    yourself from the 45 degree angled wall and into the cube chamber.
    
    11.  Get the cube.  Wait for the moving platform, jump onto it, and
    leave the cube on it.  Fall back down into the lower chamber, shoot
    the blue portal over to the other side of the room again (again, not
    on the section you came in by) and place the yellow portal in the
    lower chamber.  Pass through the yellow portal and collect the cube
    off the platform, placing it securely on the platform you're on.
    Pass back through the blue portal, press the button to open the wall,
    then return through the yellow portal, get the cube, and carry it
    back through the open wall.  Drop it on the button.
    
    12.  Use portals to get back to the platform with the exit gate. Shoot
    the blue portal onto the wall above the exit gate, fall down onto the
    platform in front of and below you then shoot the yellow portal onto
    the floor and pass through. (Don't fall all the way down through the
    yellow portal, as you DON'T want a fling this time!)
    
    13.  Pass through the exit gate and down the corridor.  No, it's not
    the end.
    
    * But you do get to blow up a security camera (right wall).  So that's
    nice.
    
    14.  Ok, this bit is hard, but fun.  Shoot the blue portal onto the
    only platform that you can see above the killer floor.  To the left of
    where you came in is a deep pit; shoot the yellow portal there and
    then jump down into it.  You should bounce up through the blue portal,
    into the air.  As you bounce up you will be able to see the surface of
    the next highest platform; shoot the yellow portal onto it.  You will
    fall back down into the blue portal and be launched out of the yellow
    portal on the higher platform, from where you should be able to see
    the surface of the next platform in the sequence; shoot the blue
    portal onto it, then fall back down into the yellow portal, and keep
    climbing this way, alternating portals.  If you miss one, just allow
    yourself to fall back into the portal you came from, bounce up and
    down again, and then give it another try - but DO NOT TOUCH THE
    DIRECTION KEYS; if you miss falling into a portal, you're stuck.
    There are several platforms followed by a 45 degree angled fling
    platform to climb up in this way.  If it becomes difficult to keep
    track of what's going on while the screen is spinning wildly, bear in
    mind that the screen spinning does not affect the actual of your
    mouse.  In other words, line up your crosshairs as far as you can,
    then when the screen starts to spin take your hand off the mouse, wait
    to fall and bounce back through the portal, and your crosshairs will
    be back in the same position they were before and you can carry on
    lining up.
    
    15.  Get in the lift.
    
    "Well done.  Be advised that the next test requires exposure to
    uninsulated electrical parts that may be dangerous under certain
    conditions.  For more information, please attend an Enrichment Centre
    Electrical Safety seminar."
    
    TEST 19 --------------------------------------------------------------
    "Welcome to the final test.  When you are done, you will drop the
    Device in the Equipment Recovery Annex.  Enrichment Centre regulations
    require both hands to be empty before any cake *static* ake.."
    
    *  Security camera on your right as you round the corner.
    
    1.  Shoot a yellow portal onto the 45-degree angled wall below the
    emitter, and a blue portal onto the 45-degree angled wall below the
    reciever.  Let a pellet pass through.  Once it passes through the
    portal, shoot the blue portal somewhere else (out of the way of the
    pellet) so that when the pellet bounces back off the portal-proof
    wall, it hits the 45-degree angle in the normal way and is
    reflected into the reciever.
    
    2.  Notice that, at the corner of the moving platform's "track" there
    is a platform and a portalable wall.  Shoot the blue portal onto
    the wall behind that platform, then the yellow platform onto any
    safe wall, and pass through it.  Looking beyond the corner along the
    track there is a door in the way, but you can shoot the wall of an
    alcove on the left; shoot the yellow portal there and pass through
    the blue portal.
    
    *  Security camera above the switch in the alcove.
    
    3.  Hit the switch in the alcove and quickly shoot the blue portal
    onto the side wall beyond the door.  Look through the yellow portal
    and wait for the platform to arrive, then jump on the platform
    through the portal.
    
    4.  Shoot the yellow portal onto the wall where the trapped pellet is
    bouncing back and forth, and after it passes through, shoot the
    yellow portal somewhere else (behind/above you) to get the pellet out
    of the way.
    
    *  Security camera on the corner of the platform's track.
    
    5.  Shoot the blue portal onto the side wall beyond the blocking wall
    on the platform track, then shoot the yellow portal onto the blocking
    wall.  Very carefully jump through the yellow portal so that you are
    standing "in" the blocking wall, then wait for the platform and jump
    onto it.  You will now see the cake symbol on the wall, and the
    platform will round the final corner.. straight into an incinerator.
    
    "Congratulations.  The test is now over.  All aperture technologies
    remain safely operational up to 4000 degrees Kelvin.  Rest assured
    that there is absolutely no chance of a dangerous equipment
    malfunction prior to your victory candescence.  Thank you for
    participating in this Aperture Science Computer Aided Activity.
    Goodbye."
    
    THE CAKE -------------------------------------------------------------
    1.  Well, of course, you're not jumping in the stupid fire.  Shoot
    the blue portal above the platform over the fire, then the yellow
    portal on the side wall, and jump through.
    
    "What are you doing?  Stop it!  I-i-i-i-i-i-i-ii...eee are pleased
    that you made it through the final challenge where we pretended we
    were going to murder you.  We are very, very happy for your success.
    We are throwing a party in honour of your tremendous success.  Place
    the device on the ground, then lie on your stomach with your arms at
    your sides.  A Party Associate will arrive shortly to collect you for
    your party.  Make no further attempt to leave the testing area.
    Assume the Party Escort Submission position or you will miss the
    party."
    
    2.  On the higher platform, look back at the way you just came and
    you'll see an entrance at the top.  You need to fling yourself there.
    Place the blue portal on the very top of the back wall of the platform
    you're on, then place the yellow portal on the floor, fall through it,
    and as you fall shoot the yellow portal where you are about to land.
    This should fling you into the upper chamber.
    
    3.  Walking down the corridor here will unlock the Partygoer
    achievement.
    
    4.  Try to climb the stairs in the room, but they'll fall to bits, so
    use portals to reach the upper floor.  The door here is slightly ajar;
    "use" the door to open it.  Climb the stairs in the chamber beyond and
    you'll come up to a locked door in a link-fence wall. Um, let's just
    suffice it to say that there is a portal-able wall in the space beyond
    the fence, and you can shoot through the fence.
    
    "Hello.  Where are you?  I know you're there.  I can feel you here.
    Hello."
    
    5.  In the next chamber, use portals to safely pass through the left-
    hand fan (the fan blades block your portal shots but you can time a
    shot through them), then again use a portal to move to the far side of
    the large chamber that's visible from beyond the fan.
    
    6.  Face the way you came and shoot the blue portal high on the
    opposite wall of the chamber.  Shoot the yellow portal onto a safe
    wall and you should be able to jump/fall through and land on the
    gurney on the other side of the room.
    
    7.  Go in the door, just for fun, and look around at the offices and
    things there.  This is where you'll first see the name of the computer
    running the tests (GLaDOS: Generic Lifeform and Disk Operating
    Systems) and that it was designed as a competitor to Black Mesa.
    You'll be able to enter several of the observation offices that you've
    seen near the tests so far.. except that now you'll see they're..
    empty.  And filled with rubble and discord.
    
    [Note: The "Disk Operating System" is a very old computer joke.  The
    text-only predecessor to Windows, which was used on PCs in the 80's,
    was called "MSDOS" (MicroSoft Disc Operating System), but there were a
    number of other competing systems which all had "DOS" in their names
    (DRDOS, PCDOS, ProDOS, etc.) so GLaDOS is just continuing the trend.
    :) ]
    
    8.  Once you've finished enjoying the plot, move over to the other end
    of the gurney.  Notice the marks on the wall telling you to go up, so
    shoot the blue portal on the wall behind the partly collapsed platform
    at the top left of the chamber as you enter, then shoot a yellow
    platform on the safe floor and step through.  From there, you'll see
    another platform above the area where you came in.  Shoot a blue
    portal onto the portal-able wall opposite that platform, and then use
    the yellow portal still on the floor to fling yourself through the
    blue portal.
    
    "What are you doing?  You haven't escaped, you know.  You're not even
    going the right way.  Hello?  Is anyone there?"
    
    9.  Climb the stairs in this area, and then jump into the broken cube
    transport tube.  After a short journey, you'll fall into a equipment
    dispensor tube, where your weight breaks it and drops you back into
    the area for the "impossible" test 9.
    
    "Okay.  The testing is over now.  You win.  Go back to the Recovery
    Annex for your cake.  It was a fun test, and we're all impressed at
    how you won.  The test is over.  Come back."
    
    10.  Stand on the button to open the exit gate, and shoot the blue
    portal through it.  Shoot the yellow portal onto any safe wall and
    pass through, then walk to the end and fall down the open lift shaft.
    
    "Uh-oh.  Somebody cut the cake.  I told them to wait for you but they
    cut it anyway.  There is still some left, so if you hurry back.."
    
    11.  Shoot the blue portal onto the ceiling above the storage boxes
    and the yellow one on the bottom of the lift shaft, and pass through,
    crouching.  Climb onto the rising/falling pistons and, when the higher
    one is in the raised position, shoot the yellow portal onto the top of
    the platform that's back the way you came.  Fall off the piston and
    follow the chamber around to get to the storage boxes from the other
    side.  Crouch again, get under your previous portal, and then uncrouch
    under it to stick your head through the portals!  Jump out, then run
    along the top of the crushing piston to the painted sign on the wall.
    
    12.  Shoot the blue portal through the gauze at the end of the
    passage, then come back the way you came, walk across the top of the
    piston again to get back to the top of the platform above the storage
    boxes, and shoot the yellow platform onto the floor and pass through
    it.  Use a very small "fling" to get yourself to the ongoing passage -
    shoot the blue portal onto the wall behind and above you, the yellow
    portal onto the wall in front of you, then jump through.
    
    (Map break)
    
    "You're not even going the right way.  Where do you think you're
    going?  Because I don't think you're going where you think you're
    going.  Hello?"
    
    13.  Take the right branching corridor and climb the stairs.  (There's
    a secret area you can reach by going underneath the staircase and
    then using portals to pass through a chainlink fence, then crouching
    through a passage, but there isn't really anything interesting there.)
    While overviewing the piston room, shoot a portal right across the
    room onto the upper of the two floors visible across the room, then
    shoot the opposite portal onto any safe wall and pass through.  From
    here, if you move to the correct angle you can juuuuuuuust see a
    portalable wall at the back of the highest passage out of the room
    (on your left as you face the pistons).  It's there!  Trust me on
    this! Shoot a portal there, and then pass through to it.  Pass along
    the corridor.
    
    "Didn't we have some fun, though?  Remember when the platform was
    sliding into the fire pit, and I said 'Goodbye', and you were like,
    'No Way', and then I was like, 'We pretended we were going to murder
    you'.  That was great.  Is anyone there?"
    
    14.  Shoot the blue portal onto the ceiling of the area above you,
    then the yellow portal onto the ceiling above one of the pistons.
    Then stand on the piston and let it push you through the portal. Jump
    across the two horizontal pistons onto the platform.  Use the platform
    you are on, and the portal-able wall far above you, to perform a fling
    to access the area opposite that portal-able wall.  You know how to do
    a fling by now, right?
    
    15.  Don't try and go through the fast moving pistons.  Shoot a portal
    behind them, then the opposite portal onto any safe wall and pass
    through it.
    
    "You really shouldn't be here.  This isn't safe for you.  It is not
    too late for you to turn back.  I am not angry.  Just go back to the
    testing area."
    
    16.  Again, don't bother with the two moving pistons.  Look carefully
    through the chamber they're in and you should be able to shoot a
    portal through onto the wall behind them, then walk through your
    existing portal to get there.
    
    17.  More pistons to not bother with.  Shoot the blue portal above the
    piston that the "over here" arrow points to and the yellow portal onto
    any safe wall.  Pass through.  Then, shoot the blue portal onto the
    wall at the very top of the chamber, between the two pistons.  Pass
    back through the yellow portal, and carefully position yourself to be
    "inside the wall".  You should be able to see the portal-able floor of
    the top of the chamber and shoot the yellow portal there.  (If you
    can't fire, just move forward a tiny bit more.) Then shoot the blue
    portal onto any safe wall and pass through.
    
    18.  Walk through the chamber and fall down on the right hand side of
    the T junction in the cube delivery pipe.  Crouch and walk along the
    pipe, then fall down onto the lower pipe that crosses it.
    
    "You should have turned left before.  It's funny, actually, when you
    think about it.  Someday we'll remember this and laugh, and laugh, and
    laugh.  Oh boy.  Well, you may as well come on back."
    
    19.  Follow around the corner.  When you reach the piston, turn to the
    left and shoot the blue portal above the point where the piston hits.
    Walk back along the pipe and shoot the yellow portal onto a wall, then
    wait for the piston to be fully extended, and carefully jump across
    the killer floor through the portal.  (You can make this jump but it's
    tricky - make sure to get as close as you can to the edge of the pipe
    you're on.)  Walk along the piston and onto the upper platform.
    Follow the platform along and then jump down the hole.
    
    (Map Break)
    
    20.  Check out the "secret" storage area through the crouch tunnel,
    then walk across into the next section.  The pipes under you will open
    and drop you into a trap - don't worry, this is meant to happen.
    Three doors around the trap will open, each one revealing a turret
    behind.  As each door opens, quickly shoot the blue portal onto the
    side wall of the chamber inside, then the yellow portal onto any safe
    wall, then pass through and push the turret over.  Do this quickly to
    each of the three turrets as it arrives.
    
    21.  I have no idea if this is how you're supposed to solve this
    puzzle, but what the heck.  Get one of the oil drums from the central
    chamber, drop it in the chamber with the grabbing arm, then stand on
    it.  You should now be able to see a portal-able wall in the room off
    to the right.  Shoot a portal on it, then put the opposite portal on
    any wall and pass through.
    
    "You're not a good person.  You know that, right?  Good people don't
    get up here.  Can you hear me?"
    
    22.  Portal through the chain-link fence and push the blinking turret
    over.  It can be tricky to find a portal-able spot here; I went
    through on top of the table with the radio! :)  Move the turret until
    its blinking beam isn't shining at the opposite corner of the area any
    more, then move over there and look up and towards the way you came in
    for a portal-able ceiling on the upper level above the cube transport
    tube.  Portal through and walk around the walkway through the door.
    Crouch through the passageway, fall into the area with the turret and
    push it over.
    
    23.  Enter the new area.  There is another secret storage area on the
    far wall of this area on the right.  And how to get out?  Well, that
    nifty moving wall that let you in is portal-able on both sides, and it
    stopped at a 45 degree angle.  You guessed it - it's flingin' time!
    Fling yourself onto the collapsed walkway and walk around the
    corridor.
    
    "This is your fault.  It didn't have to be like this.  I'm not kidding
    now.  Turn back or I will kill you.  I'm going to kill you, and all
    the cake is gone.  You don't even care, do you? This is your last
    chance."
    
    24.  You can enter an office on the right here, but only for fun. Move
    on, through the force field, and open the door.  There's a nasty robot
    here that shoots rockets.  Fortunately, it's really slow and easy to
    dodge (but unfortunately one rocket kills you, so be careful).  You
    can have fun making it shoot itself if you want, but all you need to
    do is make it shoot once (to break the glass on the room you're in),
    then run across to the otherside of the chamber it's in, make it shoot
    at you again and dodge (to break the glass on the next room) then
    jump through the glass and run out the door.  While you're here,
    though, shoot a yellow portal onto one of the walls in its chamber.
    
    25.  Walk down the corridor and through the hall, then through the
    door.  Hum, we need to break through another pane of glass.  Hey, I
    know what to do!  Shoot the blue portal on the wall opposite the
    glass.  Hello again, Mr Rocket Turret!  Would you be so kind as to
    shoot me again, so that I can dodge and your rocket will hit this
    glass?  Much obliged!  Once that's done, shoot the blue portal
    somewhere harmless (on the other side of the door you just came
    through is a good bet) and follow the arrow.
    
    26.  Oops, a crouch tunnel that's too high to get in.  Again, I have
    no idea if there's some better way of doing this with portals, but
    I just went and got a chair from the office with the rocket turret it
    and stood on it.  Shoot a portal through the fan at the end onto the
    wall, then crawl back through the tunnel and shoot the opposite
    portal onto safe wall and pass through.
    
    27.  Shoot a portal onto the wall above the red metal platform against
    the wall over the killer floor, then shoot the opposite portal onto
    any safe wall and pass through, and walk along the red platform.
    
    (Map break)
    
    28.  Walk along the red platform until you can see the safe floor at
    the end of the passage.  Shoot a portal onto it, then the opposite
    portal onto the wall your platform is up against, and pass through.
    
    29.  Shoot a portal through the tiny little grating at the end of this
    platform, then shoot the opposite portal onto any safe wall and pass
    through.
    
    30.  Walk around on the mucky floor (it makes you skid, but there's
    no puzzle or anything with it!  Weird) until you can see a portal-able
    wall above you, and portal onto it.  Be ready for a shock!
    
    31.  Well, I warned you!  Huge numbers of turrets appear.  Don't
    panic.  Treat this exactly like you did the earlier trap.  Portal onto
    the side wall of one of the turret chambers and push the turret over.
    Then, from inside the chamber, try to find the wall of another turret
    chamber, portal to it, and push over that turret too.. and keep going
    and climbing that way.
    
    32.  Once you've got all the turrets.. well, you saw that two of those
    turrets had 45 degree walls protecting them?  Could it be flingin'
    time?  Yes, you've got it.  You need to fling from the higher of the
    two walls, but you may need to fling from (or, if you're careful, just
    stand on) the lower 45 degree wall in order to see it.  Use the yellow
    portal on the 45 degree wall and the blue portal on the floor.  This
    is a difficult fling and it may take you a lot of attempts, but it is
    possible.
    
    33.  As you move down the next corridor, you face two turrets.  Hey, I
    wonder if the turrets would like to try doing a fling?  Hide behind
    the pipes to avoid their fire, and shoot blue portals under them.
    
    34.  Leave a blue portal underneath the upward shaft that you're at
    the bottom of.  Move back to the platform and shoot the yellow
    platform on the floor of the huge chamber you just came from, and then
    jump down into it to be sent flying up the shaft.  Where you land, you
    should be able to see a portal-able wall above and in front of you;
    shoot the yellow portal there, then gently drop through the blue
    portal again.  (Don't fall through the shaft into the blue portal.)
    
    35.  Cross over the big scary bridge and into the offices beyond.
    Explore the office a little if you like, then climb the stairs and
    cross the big bridge into the silo, and, hey, it's..
    
    GLADOS ---------------------------------------------------------------
    "Well, you found me.  Congratulations.  Was it worth it?  Because
    despite your violent behaviour, the only thing you've managed to break
    so far is my heart.  Maybe you could settle for that and we'll just
    call it a day.  I guess we both know that isn't going to happen.  You
    chose this path; now I have a surprise for you.  Deploying surprise in
    5, 4.. *something falls* Time out for a second.  That wasn't supposed
    to happen.  Do you see that thing that fell out of me?  What is that?
    It's not the surprise.  I've never seen it before.  Never mind.  It's
    a mystery I'll solve later, by myself.  As you'll be dead.  ....  I
    wouldn't bother with that thing.  My guess is that touching it will
    just make your life even worse.  Somehow. ...  It isn't my job to
    tell you your business, but if it were me, I'd leave that thing alone.
    Do you think I'm trying to trick you with reverse psychology?  I mean,
    seriously now?  Okay, FINE.  DO touch it.  Pick it up and just stuff
    it back into me.  Let's be honest.  Neither one of us knows what that
    thing does.  Just put it in the corner and I'll deal with it later.
    That thing is probably some kind of raw sewage container.  Go ahead
    and rub your face all over it.  Maybe you should marry that thing,
    since you love it so much.  Do you want to marry it?  Well, I won't
    let you.  How does that feel?... Have I lied to you?  I mean.. in
    this room?  Trust me. Leave that thing alone.  I am being serious now.
    That crazy thing is not part of any test protocol.  Just ignore that
    thing and stand still.  Think about it.  If that thing is important,
    why don't I know about it?  I'll tell you what that thing isn't.  It
    isn't yours.  So leave it alone.  Are you even listening to me?"
    
    1. No, you don't really have to wait for that whole spiel.  That's
    what Glados says if you don't do anything.  I'm sure you know it's a
    trick - but ya gotta do it.  Look at the back of the room where
    there's an incinerator and place a portal near it.  Climb the stairs
    on the left of the room, and enter the armored chamber, placing the
    opposite portal on the nearest portal-able wall outside first.  Press
    the button in the chamber to open the furnace, then pick up the
    'thing' Glados dropped and throw it in the furnace. (Without the
    portals you can't get to the incinerator fast enough.)
    
    "You're kidding me.  Did you just stuff that Aperture Science Thing We
    Don't Know What It Does into an Aperture Science Emergency
    Intelligence Incinerator!?  That has got to be the dumbest thing th-
    whoa.. whoa.. whoa....  Good news..  I figured out what that thing you
    just incinerated did.  It was a morality core they installed after I
    flooded the Enrichment centre with a deadly neurotoxin, to make me
    STOP flooding the Enrichment Centre with a deadly neurotoxin.  So get
    comfortable while I warm up the neurotoxin emitters..  Oh.  That core
    may have had some ancillary responsibilities.  I can't shut off the
    turret defenses.  Oh well.  If you take my advice you should just lie
    down in front of a rocket.  It'll be a lot less painful than the
    neurotoxin... Alright, just keep doing whatever you think you're
    doing.  Killing you and giving you good advice aren't mutually
    exclusive."
    
    2.  Ok, time to kill Glados!  You have to hit her three times and each
    hit is a two-step process.
     a) Put the yellow portal under Glados and the blue portal on a wall.
        Get the rocket turret to shoot at you, and redirect the rocket
        through the portal to hit Glados.  It doesn't matter where you hit
        her, as long as you do hit her.  The easiest way to do this is to
        stand with your back to the turret, look through it at Glados,
        look at the turret's search beam (which can usually pass through
        you, for some reason) and move carefully until the beam is lined
        up, then stop, wait until you hear the turret beep, and get the
        heck out of the way before you get a rocket up the bottom.
    
     b) Pick up the bit of Glados that falls off.  This is harder than it
        sounds, because Glados has a weird picky-uppy ray that she uses to
        move the items to awkward locations.  See below for how to get to
        the locations.
    
     c) Repeat step 1) from this room to stick the core in the
        incinerator.
    
    Oh, yea, there's that nasty neurotoxin business.  Basically, if you
    don't hit Glados three times within about six minutes you're dead.
    In an unusually helpful mood, Glados provides a countdown for you.
    
    So, here's how to get the three Cores:
    
    Curiosity Core:
    On top of some pipes.  Just put a portal on the wall behind them and
    reach through.
    (Core)
    "Who are you? What's that? That thing has numbers on it.  Is that a
    gun? I smell something burning.."
    (Glados, when core is destroyed)
    "You think you're doing some damage?  2 plus 2 is... *fizzfizzfizz*
    10. ... ... ... In base 4.  I'm fine.  By the way, I only let you
    live this long because I was curious about how you would behave.
    Unfortunately, I can't get the neurotoxin into your head any faster."
    
    Knowledge Core:
    On top of one of the "fins" at the top of Glados.  Put a portal on the
    wall high above Glados on that side and jump through - it's a tricky
    jump, but possible.
    (Core)
    "Two cups rhubarb (sliced), two-slash-three cup granulated rhubarb,
    one tablespoon all-purpose rhubarb.."
    (Glados, when core is destroyed)
    "Neurotoxin.. so deadly.. choking..  Hahahaha.  When I said deadly it
    had major sarcasm quotes around it.  I could take a bath in this
    stuff.  Honestly, it's not deadly at all - to me.  You, on the other
    hand, will find its deadliness rather less funny."
    
    Anger Core:
    Floating in mid-air.  This is similar to the previous one, although it
    doesn't look it - you have to put a portal high on a nearby wall, then
    jump down so you land ON TOP of it.
    (Core)
    "GRRRRRR! GRRRRRR! GRRRRRRR! GRRRRR!"
    (Glados, when core is destroyed - end of game)
    "I'm not sure what's going on outside.. all I know is, I'm the only
    thing standing between us and the world..  And I... O-o-o-o-o-o-o-o..
    *BOOM*"
    
    You are thrown up into the air, and appear in the outside world as
    bits of Glados's installation rain down around you.
    
    Then.. deep in the bowels of a complex.. is a cake.  Surrounding it,
    several lighted spheres, looking eerily like Glados' modules, start to
    activate.  A robot arm comes down and snuffs out the cake candle.
    
    Hey!  You've finished Portal!  Enjoy the ending song, and then when
    you're back at the menu, wait a few moments for the camera view to
    pan... Oh, you get the Heartbreaker achievement too.
    
    A few more choice Glados quotes from the final battle:
    
    "That thing you just broke isn't important to me.  It's the Fluid
    Catalytic Cracking Unit.  It makes shoes for orphans.  Nice job
    breaking it, hero."
    
    "I'd just like to point out that you were given every opportunity to
    succeed.  There was even going to be a party for you.  A great big
    party.  All of your friends were invited too.  I invited your best
    friend the Companion Cube, but of course he couldn't come because you
    murdered him.  None of your other friends could come because you don't
    have any other friends because you are unlikable.  It says so here in
    your file, 'unlikable', liked by no one, all formal and everything.
    It also says you're adopted."
    
    "Speaking of curiousity, I expect you're curious about what happens
    after you die.  Guess what?  I know.  But you'll find out first-hand
    before I finish explaining it to you.  But, in summary, I'd live as
    much as you can in the next few minutes."
    
    AND... THAT SONG -----------------------------------------------------
    
    "Final Test Report (Still Alive)"
    By "Geek Troubador" Jonathan Coulton
    
    This was a triumph.
    I'm making a note here: Huge Success.
    It's hard to overstate my satisfaction.
    
    Aperture Science,
    We do what we must, because we can.
    For the good of all of us
    (except the ones who are dead.)
    
    But there's no sense crying over every mistake.
    You just keep on trying till you run out of cake.
    And the science gets done, and you make a neat gun
    For the people who are still alive.
    
    [Personnel File Addendum:
    Dear <<Subject Name Here>>,]
    
    I'm not even angry.
    I'm being so sincere right now.
    Even though you broke my heart and killed me;
    
    And tore me to pieces;
    And threw every piece into a fire.
    As they burned, it hurt because
    I was so happy for you.
    
    Now these points of data make a beautiful line,
    And we're out of beta, we're releasing on time.
    So I'm GLaD. I got burned.  Think of all the things we learned
    For the people who are still alive.
    
    [Personnel File Addendum Addendum:
    One Last Thing:]
    
    Go ahead and leave me.
    I think I prefer to stay inside.
    Maybe you'll find someone else to help you.
    
    Maybe Black Mesa.
    That was a joke.  Ha ha, fat chance.
    Anyway, this cake is great;
    It's so delicious and moist.
    
    Look at me still talking, when there's science to do.
    When I look out there, it makes me glad I'm not you.
    I've experiments to run, there is research to be done
    On the people who are still alive.
    [PS:] And believe me, I am still alive.
    [PPS:] I'm doing science and I'm still alive.
    [PPPS:] I feel fantastic and I'm still alive.
    [FINAL THOUGHT:] While you're dying I'll be still alive.
    [FINAL THOUGHT PS:] And when you're dead I will be still alive.
    Still alive, still alive, still alive.
    
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