All weapons and full ammunition:
Pause the game and then press L1, L2, R1, R2, Triangle, Circle, X, Square.
Invincibility:
Pause the game play and then press L1, L1, L2, L2, R1, R1, R2, R2. You may have to enter this code in again after saving.
Level Select
Play through the game until you pass the the subway level. Then press the SELECT button to return to the main menu and press the following Up, Down, Left, Right, Up, Left, Down, Circle
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