Doom 3: Resurrection Of Evil

Invincibility:
Hold L and press X, Y, B, A during game play. A sound will confirm correct code entry. To confirm that it is enabled, fire any weapon with splash damage at a nearby wall. Note: 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.
and Cody Williams.

Doom Ultimate and Doom 2: Cheat mode
Enable one of the following codes during game play. A sound will confirm correct code entry. Repeat the code to disable its effect.

Doom Ultimate and Doom 2: Toggle God and Degreelessness mode:
Hold L and press A(4).

Doom Ultimate and Doom 2: All weapons, ammunition, and armor:
Hold L and press B(4).

Doom Ultimate and Doom 2: All weapons, health, keys, and armor:
Hold L and press A, B, A, B.

Doom Ultimate and Doom 2: Temporary invincibility:
Hold L and press X(4).

Doom Ultimate and Doom 2: Full map:
Hold L and press Y(4).

Doom Ultimate and Doom 2: Berserk mode:
Hold L and press X(3), Y.

Doom Ultimate and Doom 2: End level:
Hold L and press A(2), B(2).

Doom Ultimate and Doom 2: Chainsaw:
Hold L and press B(2), A(2).

Doom Ultimate and Doom 2: Invisibility:
Hold L and press X(2), Y(2)

Doom Ultimate and Doom 2: Light Amplification Goggles:
Hold L and press Y(3), X.

Doom Ultimate and Doom 2: Radiation Suit:
Hold L and press X, Y(3).

Doom Ultimate and Doom 2: Walk through walls:
Hold L and press A, B, Y, X. This is useful with the more difficult "impassable" levels.

Storage locker combinations:.

Locker	Code	Contents
009	492	Security Armor, Machinegun Ammo, Chain Gun Ammo
029	516	Security Armor, Machinegun Ammo
034	134	Machinegun Ammo, Chain Gun Ammo
035	134	Pistol Rounds, Shotgun Shells, Armor Shards
042	714	Shotgun Shells, Chain Gun Ammo
105	769	Pistol Rounds, Shotgun Shells, Hand Grenades
116	634	Shotgun Shells, Plasma Cells
117	634	Shotgun Shells, Chain Gun Ammo
407	937	Pistol Rounds, Shotgun Shells, Small Med-kit
408	937	Shotgun Shells
Sarge's	428

Hint: Secret web site and code:
On the Phobos Labs Sector 2 level, located in the Commons area, play all five levels of the Martian Buddy Blaster mini-game. Upon winning. you will receive a message in your personal PDA giving you this link: http://www.martianbuddy.com/blaster.html. This is one of two ways to get the code (634) for lockers #116 and #117 in the Delta Labs. The second method is to get the Patrick Hook PDA.