MDK Cheat Codes
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Hit the F1 key (to get to the help screen) before you type in these codes.

HEALME          Full health
INEEDABUGGUN    Gun powerup
NASTYTHOTTHANKS Homing sniper grenade powerup
HOLOCURTISFUN   Decoy powerup
TORNADOAWAY     Tornado powerup
ILIKETOLOB      Mortar powerup
KILL            Kill yourself