FINAL DOOM

First pause the game and then enter any of the following codes.

God Mode:

Down, L2, Square, R1, Right, L1, Left, Circle

Weapons and ammo:

X, Triangle, L1, Up, Down, R2, Left, Left

Level Skip:

Right, Left, R2, R1, Triangle, L1, Circle, X (then hit X to skip)

Complete Map:

Triangle, Triangle, L2, R2, L2, R2, R1, Square