Doom III - PC/Cheats

From WikiCheats

Bring up the console by pressing Ctrl, Alt, +, then type in the code.

Code	Effect
god	God mode
give all	All items and weapons
notarget	You become invisible to enemies
noclip	Walk through walls
freeze	Freeze everything on the screen
killmonsters	Kills all monsters
aviDemo	Records your game to an AVI file
status	Displays your status
benchmark	game bench mark
gfxinfo	Displays information about your graphics card
give weapon_chainsaw	Gives you a chainsaw
give weapon_rocket launcher	Gives you a rocket launcher
give weapon_machine gun	Gives you a machine gun
give weapon_shotgun	Gives you a shotgun
give weapon_plasmagun	Gives you a plasma gun
give weapon_bfg	Gives you a big gun