Doom

IDDQD = God mode
IDSPISPOPD = Clipping mode
IDKFA = Full ammo, all guns, and all keys
IDCHOPPERS = Chainsaw
IDCLEV## = Warp 1st #=episode 2nd #=level
IDDT = In map mode gets full map 1st time, 2nd time shows monsters, players, 3rd time takes effects off
IDMYPOS = Shows player position on map
IDBEHOLDS = Gives Berzerker pack
IDBEHOLDI = Invisible
IDBEHOLDV = Invulnerable (certain amount of time)
IDBEHOLDR = Radiation suit
IDBEHOLDA = Reveal entire map
IDBEHOLDL = Light amplification goggles