No field boundaries:
Press Circle (x2), X, Left when the team match-up is displayed while the upcoming game is loading.
Press Up (x2) at the play selection screen to hide your play from your opponent.
Press Turbo, Jump, and Pass to change the icons below the helmets on the versus screen.
The numbers in the following list indicate the number of times each button is pressed.
After the icons have been changed, press the D-pad in the indicated direction to enable the code.
The name of the code and a sound will confirm correct code entry.
Example, to enter 3-1-2 Left, press Turbo (x3), Jump, Pass (x2), Left.