Adidas Power Soccer '98 - Platform: Playstation 1

Cheat mode
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Hold L1 + L2 + R1 + R2 at the main start-up screen to display the cheat entry screen. 
Then, enter one of the following codes to activate the cheat function. Big head mode 
Press Square, Circle(2), X, Triangle, X, Square, Circle. Hidden teams Press X, Triangle, 
X, Square, Circle, Square, X, Triangle. 
A new flag will appear to the right of The Netherlands. View credits Press Circle, Square, 
Triangle, Circle, X, Triangle(2), Square. Bonus stadium Press Square, Circle, Square, 
Triangle(2), Circle, X(2) to enable "The Difference" stadium. Win match Press X, Triangle(2), 
Circle, X, Square, Circle, Triangle. Then, pause game play to win the match of your choice.