Doom All weapons and armor: Note: This code requires a six button controller. Press B + C + Y + Z during game play. Invincibility: Note: This code requires a six button controller. Pause game play and press X + Y + Mode + Up. All weapons: Note: This code requires a six button controller. Pause game play and press A + C + Mode + Up at the same time. Invincibility, full health: Note: This code requires a six button controller. Pause game play and press Up + Mode + X + Z. Note: Game play may not progress past level 15 if this code is enabled. All weapons, full ammunition, all keys: Note: This code requires a six button controller. Pause game play and press A + B + C + X + Y + Z . Note: Game play may not progress past level 15 if this code is enabled. Weapon select: Note: This code requires a six button controller. Press one of the following controller combinations to activate the corresponding weapon. Weapon Code Chainsaw Mode + Start Pistol Mode + A Shotgun Mode + B Chaingun Mode + C Rocket Launcher Mode + X Plasma Rifles Mode + Y BFG 9000 Mode + Z Hint: Enemies: Former Soldiers: They resemble your old friends, but now they just fire pistols at you. They drop clips for the chaingun and pistol when killed. Former Sergeants: Meaner and tougher. They carry shotguns and do more damage then soldiers. They drop shotguns when killed. Imp: This creature throws fireballs and takes more bullets to kill. Demon: Appear in most areas and can rip your head off if you are not careful. If you see more of them, use the chaingun. Cacodemon: These creatures are ugly and have one big mouth. If they see you, they will fire lightning balls from their mouth. Use your rockets. Mancubus: You have to use more then a chaingun to kill them. Use ammo with caution. Arachnotron: Fires plasma energy at you. Use your rifle. Spider Demon: The ultimate enemy. Has a super chaingun mounted on her body. Use your plasma rifle or rocket launcher.