Various cheats
     While  playing,  press  [CTRL]  + [ALT] + [~] (tilde) to open the
console, then type any of the following cheat codes:

Cheat code:	        Result:
God	                God Mode
give all	        All Weapons, Full Ammo, Armor
killmonsters	        Kill All Monsters
noclip	                No Clipping Mode
notarget	        Invisibility to Most Enemies
kill	                Suicide
give ammo	        Max Ammo
give health	        Max Health
give keys	        Get All Keys