These are the Ultimate DOOM and DOOM 2 cheats which are only included with the Limited Edition Doom 3 game.

• All Keys, All Weapons, and Full Ammo: hold down LEFT TRIGGER and press A,B,A,B
• Berserk Mode: hold LEFT TRIGGER and press X,X,X,Y.
• End Level: hold down LEFT TRIGGER and press A,A,B,B.
• Chainsaw: hold down LEFT TRIGGER and press B,B,A,A.
• Weapons and Ammo: hold down LEFT TRIGGER and press B,B,B,B.
• GOD Mode: hold down LEFT TRIGGER and press A,A,A,A.
• Invisibility: hold down LEFT TRIGGER and press X,X,Y,Y.
• Light Amplification Goggles: hold down LEFT TRIGGER and press Y,Y,Y,X.
• Radiation Suit: hold down LEFT TRIGGER and press X,Y,Y,Y.
• Show All Map: hold down LEFT TRIGGER and press Y,Y,Y,Y.
• Temporary Invincibility: hold down LEFT TRIGGER and press X,X,X,X.