Doom Cheats

All Guns & Ammo:
Pause the game & press X, Triangle, L1, Up, Down, R2, Left, Left

Full Map:
Pause the game & press Triangle, Triangle, L2, R2, L2, R2, R1, Square.

Invincibility:
Pause the game & press Down, L2, Square, R1, Right, L1, Left, Circle.

Level Warp:
Pause the game & press Right, Left, R2, R1, Triangle, L1, Circle, X.

Map With Objects:
Pause the game & press Triangle, Triangle, L2, R2, L2, R2, R1, Circle.

X-Ray Specs:
Pause the game & press L1, R2, L2, R1, Right, Triangle, X, Right.