Wear Radiation suit for 60 seconds
Type "idbeholdr" during game.

Invisible for 60 seconds
Type "idbeholdi" during game.

Invincible for 60 seconds
Type "idbeholdv" during game.

Computer map
Type "idbeholda" during game.

Wear night-vision goggles for 120 seconds
Type "idbeholdl" during game.

Strength
Type "idbeholds" during game. (Note: Cheat may cause the screen to go blank for 30 seconds.)

Chainsaw
Type "idbeholds" during game. Press "1" to use chainsaw.

Select level
Type "idclev<1-32>" during game. (Note: Levels 31 and 32 are not accessible in Nightmare mode.)

Select music
Type "idmus<1-32>" during game.

God mode
Type "iddq" during game.

Full map
Type "iddt" at the map screen. Reenter to display opponents and objects on map. (Hold [Ctrl] during a death match and type cheat four times to see other players.)

All weapons with ammunition
Type "idfa" during game.

All keys and weapons with ammunition
Type "idkfa" during game.

Display coordinates
Type "idmypos" during game.

Walk through walls
Type "idspispopd" during game.