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PC - Gruntz cheats

While playing the game, press [ENTER], then type any of the following 
cheat codes, then press [ENTER] again to activate it.

Code - Effect
mpback2life - Zombie Mode 
mpcloakingdevice - Invisibility for Selected Grunt 
mplemonbuttercremez - Bonus Level: High on Sweetz 
mpmakemesomepie - Bonus Level: Honey I Shrunk the Kidz 
mpmeepmeep - Selected Grunt is Faster 
mpohmygodtheykilledkenny - Selected Grunt Kills Instantly 
mpriorio - Bonus Level: Trouble in the Tropics 
mptraitor - Traitor Mode 
mpyouresomoney - Bonus Level: High Rollerz