Adidas Power Soccer '98 Cheats (PlayStation)

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 corresponding 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.