While paused hold L1 + L2 for ten seconds. Continue holding them and press Down, X, Down, X, Down, X.
Extra Ammo
While paused hold L1 + L2 for ten seconds. Continue to hold them and press Triangle, Left, Left, Left, Circle, Triangle, Down.
Health
While paused hold L1 + L2 for ten seconds. Continue to hold them and press Down, Right, Left, Triangle, Right, Down.
Level Skip
While paused hold L1 + L2 for ten seconds. Continue holding them and press Left, Triangle, X, Right, Circle, Triangle, Down.
Play as a Dismembered Corpse
Begin game play as any character and enable the Restore Health code. Press Start immediately after dying and select the Health option. When you resume gameplay you will take the form of a splattered corpse. Note: You cannot shoot, but can still use bombs.
Play as Fwank
At the player select screen press L1, Circle, R1, Down, Down, R1, Circle, L1, L1.
Weapon Power-Up
While paused hold L1 + L2 for ten seconds. Continue holding them and press Left, Up, X, Circle.
Display Coordinates...