Box as a Bear
At the Main Menu, press Right + Square, Right + Triangle, Right +
Circle, Right + X. Then select any boxer.
Big Head Mode
At the Main Menu, press Left + Circle, Left + Triangle, Left +
Square, Left + X.
Between fights, when given a choice to hit the heavy or speed
bag, hold L1 + L2 + R1 + R2.
Press R1 + R2 + X during a match.
Knock your opponent down in Career Mode while simultaneously
pressing Start. Choose to lose the fight and if timed correctly, the
loss will be placed on your opponent.
In Career Mode, create a boxer with the name psirules. Exit out
to the Main menu, then load the boxer. He will have 100% of
everything, 7'5'' and 250 pounds.