Directions:

Unlock Everything:
Enter SouthEnd as your profile name. (Case-Sensitive)

Unlock All Arenas:
Enter MOREROOM as Player 4's controller name.

All Teams and Players:
Enter ALL150 as Player 4's controller name.

Unlock Extreme Difficulty:
Name NO FEAR as Player 4's controller name.

Unlock Multidisc:
Name CONFUSED as Player 4's controller name.