Enter the following cheats for big fun:

OBLIVIONISOUTTHERE      The Big One - Activates all cheats
BIGBADNOODLE            Big head
HELLOSTICKY             Stick man
HENRYSBILERP            Gouraud shading                
INEEDAUPS               Blackout mode
JANESSPECIALWORLD       Jane's cheat
LEGOMANIAC              Zach attack
LILLIPUTIAN             Small enemies
PICASSO                 Pen and ink mode
TROMPEM                 Big hands and feet                          
WIZARDOFOZ              Frooty stripes
YOQUIEROJUAN            Juan's cheat