These must be entered during gameplay.
Code Effect Triangle twice, Down twice, L+R Infinite Ammo Right,Left, Down, Up and finally press L & R together invunerable Press X twice and Up twice and than L & R together Killer Weapons Left, Left, Up, Down, Left, Right Shoot out a devastating radial blast, no ammo required. Right, Left, Up, Down Spawns A Mine Underneath Your Car Left, Left, Down, Down Temporary Invisibility Right, Right, Down, Down Temporary Shield
Enter these codes in-game to perform the corresponding attack.
Freeze Attack - Freezes closest opponent
Rear Attack - Fires selected weapon backwards
Flak Attack - Intercepts and destroys any incoming missile and will knock back enemies that are in close player proximity
Napalm Attack - Adds a napalm projectile to any weapon fired (does not work with specials)
Code Effect Up, down, left, right Flak Attack Up, down, up Freeze Attack Right, left, up, up Napalm Attack Left, right, down, + fire button Rear Attack
Contributed By: scroungelo.
continuos and homing Machine Gun
Code Effect While holding L and R press X, triangle, X, triangle "Mega Guns"
Code Effect Hold L + R and press triangle, X, square, circle Health Recharged
Contributed By: jenkinsm.
Code Effect Hold L and R and press triangle, triangle, down, down "Infinite Weapons"
You can only enter the code while your playing in story mode. There is a glitch that for some reason this doesn't always work. If it won't work, you have to make another guy and a new story and try it again. It took me 12 times until I finally got it.
Code Effect Hold L and R and press Triangle, Triangle, Up, Up Weapon Power-up
Contributed By: AntiUsed.
Playing multiplayer with one game
If you want to play Twisted Metal: Head On with other PSP players around you but only have one copy of Twisted Metal, here's how you can do it:
1.Load up Twisted Metal on PSP number 1.
2.Create a game on Ad Hoc mode and start the game.
3.After the game loads, take out disk.
4.Put game in another PSP and load up game and join the multiplayer game that's been created and Join in and load up the game.
Now you both will be able to play the game in multiplayer mode. This trick can work for more than two players but the max number of players possible is 6.
Contributed By: black 13.
Unlock Tower Tooth Challenge Level
Beat the game with five characters on any difficulty and you will unlock the Tower Tooth Challenge level in Challenge Mode. You play as Tower Tooth and fight against 5 opponents in the Colliseum.
NOTE: You Tower Tooth is only playable in this challenge.
Contributed By: Karrat.
Unlockable Battlegrounds *updated*
Complete Specified Tasks To Unlock Following Battlegrounds
Unlockable How to Unlock Egypt Deathmatch Complete Balance Beam Minigame Under 3 Minutes Greece Complete Greece In Story Mode Greece Deathmatch Complete Jump Skill Minigame Under 2.5 Minutes Los Angeles - Cousin Eddy Complete Los Angeles - Cousin Eddy In Story Mode Monaco Complete Monaco In Story Mode Paris Deathmatch Complete Chopper Shoot Minigame Under 2 Minutes Roman Ruins Complete Roman Ruins In Story Mode Rome Deathmatch Complete Top Down Driver Minigame Under 2 Minutes Russia Complete Russia In Story Mode Tokyo Deathmatch Complete Subway Gauntlet Minigame Under 2 Minutes Tokyo Rooftops Complete Tokyo Rooftops In Story Mode Tokyo Streets Complete Tokyo Streets In Story Mode Tokyo Streets - Dark Tooth Complete Tokyo Streets - Dark Tooth In Story Mode
Unlockable Vehicles *updated*
Complete Specified Tasks To Unlock Following Vehicles
Unlockable How to Unlock ATV Complete Los Angeles - Cousin Eddy In Story Mode Axel Complete Shooting Rink Minigame Under 3 Minutes Cousin Eddy Complete Los Angeles - Cousin Eddy In Story Mode Crimson Fury Complete Death Race Minigame By Destroying 10 Cars Dark Tooth Complete Story Mode Once Hammerhead Complete Sky Track Minigame By Finish First Place Mr. Slam Complete Freeway Slalom Minigame Under 2 Minutes Tower Tooth Complete Story Mode Using Any 5 Vehicles
Killing The Big Blue Stadium Music
During story mode, go up to the stage where the band is performing and blow them up ( The napom beside them works perfectly ). The moment they are killed, the song will stop playing and will be replaced with a different, lyricless song.
Contributed By: Bendilin.
Total Destruction in Russia
If you shoot the four consoles next to the tanks in Russia you can make them launch missiles that will destroy some building anjd allow you to access buildings and weapons!
War of the Monsters Posters
In the Los Angeles level, there are some posters on the wall of the studio next to the water tower. They are both movie posters seen at the loading screens in Incogs other game, War of the Monsters.
Contributed By: PS2112.
Destroying the Eiffel tower.
In the Paris level, use the teleporter that leads to the top of the eiffel tower, than lead a remote bomb near one of the beams at the top, jump off, and use it! This will destroy the tower and allow access to some buildings and weapons!
Destroying the Tokyo Tower and entering the dojo
In the Tokyo Streets level, goto the big red Tokyo Tower. Use a remote control bomb on the side of the tower. It'll blow up the tower. Blowing up the tower will leave a bridge, connecting to the dojo (behind the teleporter on ground level). At the dojo is health and other weapons.
Contributed By: Xanarki.
Mini game in Greece
Get onto the large ship and you'll find a path that leads to the bottom of the ship, go either dirextion but don't go on the lift, instead try going towards the other side of the ship and you'll see the teleporter that takes you to that levels secret mini game.
Secret mini game in Big Blue Stadium level
In one of the cornors is a glass window, shoot it and enter, inside is another set of windows, shoot them out and inside is the teleporter to the mini game.
Secret mini game in Egypt
Blow up one of the statues and a secret passageway is behind it. Follow it and it leads to the teleporter for the mini game.
Secret mini game in L.A. Level
On the West side of the level (oposite end of the teleporter pad to sign) there's a teleporter pad in one of the buildings. Just shoot the doors and then stand on the pad to unlock the Solom mini game.
Secret mini game in Monoco level
Have the lake behind you (bleachers area) and drive to the right. You'll com to a grassy area to your right and the teleporter is there for the mini game.
Secret mini game in Paris
Near the center of the level, go to what looks like a museum and shoot the doors off. The teleporter to the mini game is located in there.
Secret mini game in Rome
Climb to the top of the building and turn right and go all the way to the end and you will find a teleporter that leads to the secret mini game.
Secret mini game in Russia level
Find the large bell and keep shooting it until it opens. Enter and you'll find the teleporter to the mini game in there.
Secret mini game in Tokyo Rooftops level
The teleporter to the mini game is located in the building behind the "TOKYO LTD" sign.
Secret mini game in Tokyo Streets level
From the starting point head straight and when you reach the hill, take your first right and the teleporter for the mini game should be in the middle of the street.
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You can submit a problem report for any non-working or fake code in the lists above.