Addidas Power Soccer '98 Cheats (PlayStation)

At the main menu screen
Hold L1 + L2 + R1 + R2 to
show the cheat entry screen. Now you may enter one of
these codes:

Big head mode

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