Enter the following Cheat codes at the Pause Screen, while playing within a game. Be sure to hold L1 and L2 for about 10 seconds before entering codes and keep holding them until the code is finished.
For Extra Ammo press:
Triangle, Left, Left, Left, Circle, Triangle, Down.
For Level Skip press:
Left, Triangle, X, Right, Circle, Triangle, Down.
For Health press:
Down, Right, Left,Triangle, Right, Down.
For Weapon Power-up press:
Left,Up, X, Circle.Each cheat should appear at the Pause Screen if entered correctly.just highlight the cheat you wish to use and press X to activate it.
Use a Corpse
Do the health code above. The immediately after dying press Start and pick the Health option. Your character will now be a corpse which can't shoot but can use bombs