Cheats for Doom 2 (GBA)

Press Start to pause the game, then hold L + R and enter one of the codes.
Code - Result:
A, A, B, A, A, A, A, A. - God mode
A, B, B, A, A, A, A, A. - All weapons, items, keys
B, A, A, A, A, A, A, A. - Computer map
B, B, A, A, A, A, A, A. - Radiation suit
B, B, B, A, A, A, A, A. - Invincibility
B, A, B, A, A, A, A, A. - Berserk
A, A, B, A, B, B, B, B. - Disable God mode