Code Effect
IDDQD Invulnerability
IDBEHOLDI Temporary invisibility
IDBEHOLDR Temporary radiation suit
IDBEHOLDS Temporary berserk
IDBEHOLDA Temporary automap
IDBEHOLDV Temporary invulnerability
IDKFA Full health, ammo, weapons, armor and keys
IDFA Full health, ammo, weapons, and armor
IDDT Change map detail
IDCHOPPERS Gain chainsaw
IDCLEVxx Warp to level 'xx' where xx is 01 to 19
IDMYPOS Displays your position and bearing
IDMUSxx Music select. 'xx' is the level who's song you want.
IDSPISPOPD Walk through walls!
IDCLIP Walk through walls
iddqd Toggles God-mode (still damageable by hazards). Causes Health to drain slowly at all times on Nightmare Difficulty.
idkfa Gives the Doom Marine fully upgraded Health, Armor, and Ammo Capacity, as well as all unlockable Weapons, Weapon Mods (all fully upgraded), Suit Mods, and all available Suit Mod slots.
idfa Gives player fully upgraded Armor, Health, and Ammo Capacity.
idka Gives player all Weapon Mods, Weapons, and Weapon Mods are all fully upgraded.
ida Gives the Doom Marine all Suit Mods and all Suit Mod slots.
iddt Reveal all Secrets, items, and any unexplored areas of the map.
idgk Toggle Glory Kills only. Makes all enemies immune to firearms and normal weapons, requiring player to kill them with Glory Kill animations.