idkfa-gives all keys, weapons, and ammo

idfa-gives all weapons and ammo (Doom 2 only)

iddt-toggle map mode (use when looking at map)

idclevxy-change level to episode x, level y (Doom), or, in Doom 2, warp to level xy(01-32)

idclip-toggles no clipping mode (Doom 2 only)

idspispopd-toggles no clipping mode (Doom only)

idbeholdi-invisiblity sphere

idbeholds-berserk pack

idbeholdv-invulnerability sphere

idbeholdr-radiation suit

idbeholda-full map

idbeholdl-light amplification visor

idmusxx-change music to that in level xx (Doom 2 only)
Network Cheat: Hold ALT and type IDDT 4 times while in map mode.