Cheats for Adidas Power Soccer '98 for PSX

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:

Hidden stadium

Press Square, Circle, Square, Triangle(2), Circle, X(2) to enable "The 
Difference" stadium.

Bonus teams

Press X, Triangle, X, Square, Circle, Square, X, Triangle. Then, a new flag will 
appear to the right of The Netherlands.

Win match

Press X, Triangle(2), Circle, X, Square, Circle, Triangle. Then, pause the game 
to win the match of your choice.

Big head mode

Press Square, Circle(2), X, Triangle, X, Square, Circle. 

View credits

Press Circle, Square, Triangle, Circle, X, Triangle(2), Square.