To unlock Shaq, go to the main menu and press
Right, Up, Left, Right, Down, Left, Up, Right, Down, Left, X, Y, Y, X, Start.
When the code is entered correctly, a message will pop up on screen telling you have unlocked a new fighter. Then head into an Exhibition bout and you will find Shaq among the heavyweight contenders.
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Tapout guys
down, down, up, down, left, down, select, start