Cheat: Pint-Sized Pugilist
Hold UP on the venue selection screen until the sound of a bell is heard. Select a venue to begin a fight with both fighters small.
Unlock All Venues
In the Game Modes screen tap left 16 times until you hear a bell. you now have all venues. (Must be repeated everytime you restart the game).
Unlock Extra Boxer
Go to create a champ mode, enter your first or last name as GETFAB and save the profile. Go to Play Now or Hard Hits. Fabolous is now unlocked as a heavyweight boxer.
Unlock: Lil Jon
Enter Liljon in the first name field for your created boxer. Save it and Lil Jon will be unlocked.