Enter Mr. Skitz as your first name in create a champ mode to have full stats.
Enter NEWVIEW as your first name in create a champ mode to unlock all arenas.
Win a career mode fight at the Staples Center or Madison Square Garden to unlock it.
FIGHT AS KO REY MO:
Beat Ko Rey Mo in the light heavyweight division to unlock him.
THE BURGER KING AS YOUR TRAINER:
Beat the Burger King event in career mode, then when selecting your trainer, press DOWN until Burger King is selected.
EASY CAREER WINS:
Set Illegal Blows to ‘off’. Get the illegal blow ‘Elbow Shot’ from the store, start a fight and use it as a counter. Ouch!