Doom - Collector's Edition
During play, type the codes with the keyboard.
You don't need to hit [Enter] after the code.
After entering, a message should be displayed at the
top of the screen telling which cheat mode was activated.
iddqd - Degreelessness mode (God mode)
idkfa - Very Happy Ammo (full ammo, 200% armor, all weapons)
idspispopd - No clipping (you can walk through walls)
idbehold - Displays menu (followed by S, V, I, R, A, or L)
idclev - Warp (add episode and level number)
idmypos - Displays your coordinates in hex
idchoppers - Gives you the chain saw
iddt - Toggles Automap between normal, full, and full with objects
(enter when looking at the Automap)