Doom 3 Codes -

Skip checkpoints:
Hold and press , , , during game play to advance to the next checkpoint. A sound will confirm correct code entry.

Invincibility:
Hold and press , , , during game play. You will hear a sound if you have entered the code correctly. To verify that it is enabled, fire any weapon with splash damage at a nearby wall. REMEMBER: The code cannot be enabled until you take the elevator after being attacked at the start of the game. When a new area is loaded, the code must be re-enabled to regain its effect.

Doom Ultimate and Doom 2: Toggle God and Degreelessness mode:
Hold and press (x4).

Doom Ultimate and Doom 2: All weapons, health, keys, and armor:
Hold and press (x4).

Doom Ultimate and Doom 2: Temporary invincibility:
Hold and press (x4).

Doom Ultimate and Doom 2: Full map:
Hold and press (x4).

Doom Ultimate and Doom 2: Berserk mode:
Hold and press (x3), .

Doom Ultimate and Doom 2: End level:
Hold and press (x2), (x2).

Doom Ultimate and Doom 2: Chainsaw:
Hold and press (x2), (x2).

Doom Ultimate and Doom 2: Invisibility:
Hold and press (x2), (x2)

Doom Ultimate and Doom 2: Light Amplification Goggles:
Hold and press (x3), .

Doom Ultimate and Doom 2: Radiation Suit:
Hold and press , (x3).