Unlock All Venues:
     Hold  or  repeatedly  tap  Left at the game mode selection screen
until the sound of a bell is heard to unlock all venues.

Small Fighters:
     Hold or repeatedly tap Up at the venue selection screen until the
sound  of  a  bell is heard. Select a venue to begin a fight with both
fighters small.

Unlock Ghetto Fabulous:
     Enter  Getfab  as  the  first  name  of a created boxer. Save the
created   boxer  and  Ghetto  Fabulous  will  be  unlocked  under  the
heavyweights roster.

Unlock Li'l Jon:
     Enter  Liljon  as  the  first  name  of a created boxer. Save the
created   boxer  and  Li'l  Jon  will  be  unlocked  under  the  light
heavyweight roster.