Doom Cheats and Codes

IDDQD = Invulnerability
IDBEHOLDx = Gain temporary ability. x can be:
I=invisibility R=radition suit
S=berserk A=automap
V=invulnerability L=lightamps
IDKFA = Full health, ammo, weapons, armor and keys
IDFA = As above, but no keys
IDDT = While viewing map. 1x= all map 2x=more details
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 = Same as above