Various Cheats
     In  World  Mode, select New Career and choose any boxer. Name the
boxer any of the following "Names", then press Triangle:

Name                 Effect 
CLUBFUD              Unlock Jimmy Flex and Disco Stadium 
OLD MAN              Unlock John L. Sullivan and Docks Stadium 
OUCH                 Boxer's Heads Grow When Punched 
HURTS                Boxer's Heads Spin When Punched 
NECK                 Boxer's Necks Stretch When Punched 
GONE                 Invisible Boxer 
BINGY                Small Heads 
BONGY                Big Heads 
STUPID               Big Hands and Feet 
NORMAL               Disable All Cheats