First go to the help screen (F1). Then enter the following codes:
healme Health once per level
ineedabiggun Gatt powerup once per level
tornadoaway Twister powerup once per level
holokurtisfun Dummy powerup once per level
486okbyme Allow 486 machines to run
nastyshotthanks Homing sniper grenade ammo
kill Kill yourself!
More tricks, tips and cheats for this game are right here - MDK cheats
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