Type in the following codes during play: 

Code:                   Effect:
MPCASPER                Invisibility    
MPVADER                 Invincibility
MPPLAYALLDAY            Infinite Lives Mode     
MPBUNZ                  Makes Claw Strong       
MPFRANKLIN              Lightning Sword 
MPPENGUIN               Ice Sword       
MPAPPLE                 Full Health     
MPGANDALF               Full Magic      
MPFREAK                 Catnip  
MPKFA                   God Mode        
MPLOADED                Full Ammo       
MPSTOPWATCH             Timer on the bottom of the screen       
MPPOS                   Shows global position   
MPFPS                   Frames per second       
MPOBJECTS               Shows # of objects on screen    
MPNOINFO                Show/hide info for above 4 cheats       
MPLITH                  Monolith logos & Music  
MPMONOLITH              Same as above 
MPLOGO                  Same as above
MPMOONGOODIES           Bouncing treasure       
MPSPOOKY                Invisible to enemies    
MPHAUNTED               Enemies into ghosts     
MPSHADOW                Claw is a shadow        
MPSUPERTHROW            Super Throw mode        
MPHOTSTUFF              Fire Sword      
MPWIMPY                 Claw is weak    
MPJORDAN                Mega-jumping    
MPBOTLESS               Toggles the background 
MPMIDLESS               Toggles the middle plane 
MPTOPLESS               Toggles the foreground  
MPINCVID                Increases resolution    
MPDECVID                Decreases resolution    
MPDEFVID                Default resolution      
MPJAZZY                 320X200 resolution      
MPDEVHEADS              Shows developers heads in place of treasure
MPBLASTER               Full dynamite