At the main menu, press Right + Square, Right + Triangle, Right + Circle, Right + X. If you entered the code correctly, you will hear a sound. Then select any boxer to play as a bear.
Big head mode
At the main menu, press Left + Circle, Left + Triangle, Left + Square, Left + X. If you entered the code correctly, you will hear a sound.
Super boxer
Select career mode, create a boxer, and enter "PSIRULES" as the name. Save the created boxer and exit career mode. Then, enter career mode again and load the boxer, which will now have full attributes and other special features.
Regain energy
When given a choice to hit the heavy or speed bag between fights, hold L1 + L2 + R1 + R2 to regain two to eight points of energy, depending on how long the buttons are held.
Taunt opponent
During a match, press R1 + R2 + X.
