To be entered once you've already started a game. Pause game, and go into the cheat menu. CHEATS ARE CASE SENSETIVE!

TheWorldIsMine - All Maps
GiveMeHealth - Health Added
VitruviAnRush - Infinite Adrenaline
BulletsofHell - Infinite Ammo
AmAFastMachine - Run Faster

Enter "CarvErVitrUvian" as a case-sensitive code. Note: This code does not work in the retail version of the game.

You may be forced to watch a game play movie every time you start the game. In order to skip this sequence, make sure that your Xbox system clock is set to the correct date and time.