While in game play press Enter, type one of the following codes, then press Enter again to
activate the cheat function.

Function - Code 

     Traitor mode - mptraitor 
     Zombie mode - mpback2life 
     Turbo mode - mpmeepmeep 
     High On Sweetz level; when current level completed - mplemonbuttercremez 
     Trouble in the Tropics level; when current level completed - mpriorio