Invincibility:
     Name your fighter MUHAMMAD ALI to enable invincibility.

Unlock All Boxers:
     Name your fighter MIKE TYSON to unlock all boxers.

Unlock All Arenas:
     Name your fighter LENNOX LEWIS to unlock all arenas.

Big Head Mode:
     Name your fighter DAVID TUA to enable big head mode.

Dumb Mode:
     Name your fighter JESSICA MELTON to enable dub mode.

Fat Mode:
     Name your fighter RICH OBERDICK to enable fat mode.