Press [ENTER] during game play, type one of the next codes,
 then press [ENTER] again to activate it.
 
 Code - Result 
 ----------------------------------
 mptraitor - Traitor Mode 
 mpback2life - Zombie Mode 
 mpmeepmeep - Selected Grunt is Faster 
 mpohmygodtheykilledkenny - Selected Grunt Kills Instantly 
 mpcloakingdevice - Invisibility for Selected Grunt 
 mplemonbuttercremez - Bonus Level: High on Sweetz 
 mpyouresomoney - Bonus Level: High Rollerz 
 mpmakemesomepie - Bonus Level: Honey I Shrunk the Kidz 
 mpriorio - Bonus Level: Trouble in the Tropics