Invincibility:
Pause the game, then press L1, L1, L2, L2, R1, R1, R2, R2. Note: This code may need to be re-enabled after an auto-save.

All weapons and full ammunition:
Pause the game, then press L1, L2, R1, R2, Triangle, Circle, X, Square.

Level select:
First complete the Subway level. Press Select to return to the main menu and press Up, Down, Left, Right, Up, Left, Down, Circle.

8 pain killers:
Press Start to pause, then press L1, L2, R1, R2, Triangle, Circle, X, Square.

Infinite ammo:
Pause the game, then press L1, L2, R1, R2, Triangle, Square, X, Circle.

Infinite bullet time:
Pause the game, then press L1, L2, R1, R2, Triangle, X, X, Triangle.

Slow-mo sounds :
Pause the game, then press L1, L2, R1, R2, Triangle, Square, X, Circle.

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