At the main start-up screen, hold L1 + L2 + R1 + R2 to display the cheat entry screen. Then, enter one of the following codes to activate the corresponding cheat function:
Press Square, Circle, Square, Triangle(2), Circle, X(2) to enable "The Difference" stadium.
Press X, Triangle, X, Square, Circle, Square, X, Triangle. Then, a new flag will appear to the right of The Netherlands.
Press X, Triangle(2), Circle, X, Square, Circle, Triangle. Then, pause the game to win the match of your choice.
Press Square, Circle(2), X, Triangle, X, Square, Circle.
Press Circle, Square, Triangle, Circle, X, Triangle(2), Square.