To bring up the in-game cheats console, you need to add your target to the Gene Trooper shortcut. So, for example: C:\Program Files\Playlogic\Gene Troopers\GT.EXE console. Then, when playing the game, press the tilde (~) key to bring up the cheats console. Insert the cheats below for the desired effetc.

Code	Effect
give ammo	Give Ammunition.
god	God Mode.
maplist	Unlock All Levels.
give dna	Give DNA Points.
give health	Give Life.