All Working Doom 3: Resurrection of Evil Cheats - Xbox

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.

Skip Checkpoints
Hold [L] and press [B], [A], [X], [Y] during game play to advance to the next checkpoint. A sound will confirm correct code entry.

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

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.