To activate a cheat, pause the game during gameplay.
Then hold L2 and then punch in the following button sequences.


All Weapons - Square, Square, Square, L1, R1, R2, Square, Square, Square, Square, Square

Decapitating Punches - L1, L2, R1, R2, Square

Increased Looting - R1, L1, R2, L1, Triangle

Infinite Ammo - L1, L2, R1, R2, Triangle

Invincibility - L1, L2, R1, R2, X

Unlimited Time - L1, L2, R1, R2, Circle


To unlock everything in the game:

Hold L1 and R1, then enter Circle, Triangle, Square, Circle, Triangle