Cheat Mode:
Enter the following code at the Vs. screen....

Invisible Players:
Press 4 - 1 - 3 - R-Button. All of the players should then be invisible

Sticky Fingers:
Press 3 - 2 - 1 - R Button. You should then never fumble the ball

Ogre?:
Press 1 - 3 - 2 - R Button. You should then play on an ogre

Shadow Players:
Press 3-1-3-R and youll see some sweet shadow players... or ... you wont see them. heh

Play on Snow Field:
Press 2 - 2 - 5 - R Button. You should then play on a snowy field

Thanks to Revolution reader FuryX!