Cheats

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All Levels
While playing the game, press Left(4), L1, Right(4), R1.

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Codes For Portal
The included Portal "mini-game" has cheat codes that you can enter just for that game. They are as follows:

Create box : Down, B, A, B, Y, Down, B, A, B, Y
Enables invincibility : LB, Up, RB, Up, LB, LB, Up, RB, RB, Up
Fire energy ball : Up, Y(2), X(2), A(2), B(2), Up
Fire rocket projectile : Up, Y(2), B(2), A(2), X(2), Up
Portal placement anywhere: : Y, A, B, A, B, Y(2), A, Left, Right
Portalgun ID 0 : Up, Left, Down, Right, Up, Left, Down, Right, Y(2)
Portalgun ID 1 : Up, Left, Down, Right, Up, Left, Down, Right, X(2)
Portalgun ID 2 : Up, Left, Down, Right, Up, Left, Down, Right, A(2)
Portalgun ID 3 : Up, Left, Down, Right, Up, Left, Down, Right, B(2)
Upgrade Portalgun : X, B, LB, RB, Left, Right, LB, RB, LT, RT

Half-Life 2 Codes

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Invincibility : LB, Up, RB, Up, LB, LB, Up, RB, RB, Up
Restore Health By 25 Points : Up Up Down Down Left Right Left Right B Button A Button
Restores ammo for current weapon : Y B A X RB Y X A B RB
Unlock All Levels : Left, Left, Left, Left, LB, Right, Right, Right, Right, RB

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25 Health Points
While playing the game, press Up, Up, Down, Down, Left, Right, Left, Right, Circle, X.

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Full Ammo
While playing the game, press Triangle, Circle, X, Square, R1, Triangle, Square, X, Circle, R1.