DOOM III

- INVINCIBLE:
AT PDA SCREEN, HOLD L, PRESS X, Y, B, A.

- LEVEL SKIP:
AT PDA SCREEN, HOLD L, PRESS B, A, X, Y.

DOOM III: COLLECTORS EDITION ONLY CODES
- GOD MODE (CLASSIC DOOM 1&2):
DURING THE GAME, HOLD L, PRESS A, A, A, A.

- ALL WEAPONS (CLASSIC DOOM 1&2):
DURING THE GAME, HOLD L, PRESS B, B, B, B.

- INVISIBLE (CLASSIC DOOM 1&2):
DURING THE GAME, HOLD L, PRESS X, X, Y, Y.

- BERZERK MODE (CLASSIC DOOM 1&2):
DURING THE GAME, HOLD L, PRESS X, X, X, Y.

- TEMP INVINCIBLE (CLASSIC DOOM 1&2):
DURING THE GAME, HOLD L, PRESS X, X, X, X.

- END LEVEL (CLASSIC DOOM 1&2):
DURING THE GAME, HOLD L, PRESS A, A, B, B.

- SHOW MAP (CLASSIC DOOM 1&2):
DURING THE GAME, HOLD L, PRESS Y, Y, Y, Y.

- RADIATION SUIT (CLASSIC DOOM 1&2):
DURING THE GAME, HOLD L, PRESS X, Y, Y, Y.

- LIGHT AMPLIFICATION GOGGLES (CLASSIC DOOM 1&2):
DURING THE GAME, HOLD L, PRESS Y, Y, Y, X.

- CHAINSAW (CLASSIC DOOM 1&2):
DURING THE GAME, HOLD L, PRESS B, B, A, A.