You must be playing down the pitch for this cheat to work.
 
 If the opposition scores a goal, wait until your number 9 prepares to
 kick off again, press down, right, fire and then hold down. As the
 ball reaches the oppostions number 2, he will pass the ball to the
 keeper, who will miss the ball, thus an own goal being scored.
 

 Cheats:
 You can use these codes holding [C] and [+]

 Code - Result
 F1  -  Full life
 F2  -  Collect objects
 F3  -  Move different places
 F4  -  Shows location