To use these codes, simply hit the TAB key, type in the code of your choice, and press ENTER.

ALLAMMO		Gives you 999 ammo for all of your guns. 
FLY		Lets you fly around. 
GHOST		Lets you walk through walls. 
WALK		Returns you to walking mode if you are flying or ghosting. 
GOD		Makes you invulnerable to all attacks. 
SUMMON		Lets you add a weapon or an item to the world. 

		For example: SUMMON EIGHTBALL, SUMMON FLAKCANNON, SUMMON NALI, SUMMON SKAARJWARRIOR... 
PLAYERSONLY	Freezes time. Press again to resume time passage. 
OPEN{MAPNAME}	Jump to any map, just enter the name like OPEN DIG. 
BEHINDVIEW 1	Third-person style view. 
BEHINDVIEW 0	Resets above. 
FLUSH		Clean up textures  
KILLPAWNS  	Kill all monsters
SLOMO#     	Set game speed (#1-10)
KILLALL    	Kill all of indicated enemy type 
INVISIBLE  	Invisibilty
INVISIBLE0	Invisibility off

Thanks to Revolution readers Pink Floyd, Vince Lombardi, Zachary Lloyd, Halkeye, Dan The Man, Kevin Quillen, Nick, Joao U. V. Coutinho, and Sean Boivin!