Various Cheats
     At the Main Startup screen, hold L1 + L2 + R1 + R2 to display the
Cheat Entry screen. Then, enter any of the following "Codes":

Effect           Code
Hidden Stadium   Square, Circle, Square, Triangle, Triangle, Circle, X, X
Bonus Teams      X, Triangle, X, Square, Circle, Square, X, Triangle
Win Match        X, Triangle, Triangle, Circle, X, Square, Circle, Triangle
Big Head Mode    Square, Circle, Circle, X, Triangle, X, Square, Circle
View Credits     Circle, Square, Triangle, Circle, X, Triangle, Triangle,
                 Square