Final Doom
Cheat Codes/Hints
Codes
Invincable= down, L2, Square, R1, Right, L1, left, Circle.
All Weapons= x, triangle, l1, Up, Down, R2,
Level Select
Pause the game and press: Right, Left, R2, R1, Triangle, L1, Circle, X.
Map all lines
Pause the game and press: Triangle, Triangle, L2, R2, L2, R2, R1, Square. Now all walls and boundaries will appear on the map for the current stage.