Pause the game and hold L1 + L2 until the red cursor stops. Continue holding those buttons and press Left, Down, Right, Triangle, Square, X, Circle. Then, select Lives from the menu.
Additional Lives
Pause the game and hold L1 + L2 until the red cursor stops. Continue holding them and press R1, R2, X, Triangle, Square, Circle, R1, R2, Circle, Circle, Square. Then select Smart from the menu.
Extra Smart Bombs
Pause the game and hold L1 + L2 until the red cursor stops. Continue holding them and press Down, Right, Circle, Left, Right, Circle.
Increase Ammo
Pause the game and hold L1 + L2 until the red cursor stops. Continue holding them and press Up, Right, Down, Left, Triangle, Circle, X, Square, X, Triangle, Square, Circle
Level Select
Pause the game and hold L1 + L2 until the red cursor stops. Continue holding them and press X, R1, Triangle, R1, Square, Circle, R2, R2, X
Level Skip
Pause the game and hold L1 + L2 until the red cursor stops. Continue holding them and press Down, Right, Down, Right, Triangle. Press X to increase gun power.
Max Gun Power
Pause the game and do the health trick. The word "Health" will appear. While still paused press Square, Circle, Triangle or X.
Play as a heap of flesh.
Pause the game and hold L1 + L2 until the red cursor stops. Continue holding them and press right, Right, Left, Down, Down, Up, Triangle, Circle. Then select Health from the menu.
Restore Health