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Unlock Jimmy Flex and Disco stadium
Enter world mode, select "New Career" and choose any boxer, then enter "CLUBFUD" as a name and press Triangle.

Unlock John L. Sullivan and Docks stadium
Enter world mode, select "New Career" and choose any boxer, then enter "OLD MAN" as a name and press Triangle.

Boxer's heads grow when punched
Enter world mode, select "New Career" and choose any boxer, then enter "OUCH" as a name and press Triangle.

Boxer's heads spin when punched
Enter world mode, select "New Career" and choose any boxer, then enter "HURTS" as a name and press Triangle.

Boxer's necks stretch when punched
Enter world mode, select "New Career" and choose any boxer, then enter "NECK" as a name and press Triangle.

Invisible boxer
Enter world mode, select "New Career" and choose any boxer, then enter "GONE" as a name and press Triangle.

Small heads
Enter world mode, select "New Career" and choose any boxer, then enter "BINGY" as a name and press Triangle.

Big heads
Enter world mode, select "New Career" and choose any boxer, then enter "BONGY" as a name and press Triangle.

Big hands and feet
Enter world mode, select "New Career" and choose any boxer, then enter "STUPID" as a name and press Triangle.

Disable all cheats
Enter world mode, select "New Career" and choose any boxer, then enter "NORMAL" as a name and press Triangle.