Various Cheats
     Enter these at the "Tonight's Match-Up" screen:
 
Key:;
S - Square
C - Circle
T - Triangle
X - X
R - Right / L - Left / U - Up / D - Down

Effect                  Code 
Big Heads               T, S, X, C, and keep repeating 
Huge Heads              T, C, X, S, and keep repeating 
Power-Up Defense        R, U, D, R, D, U 
Max Power               R, R, L, R, X, X, R 
Quick Hands             L, L, L, L, C, R 
Power-Up - 3 points     U, D, L, R, L, D, U 
Raindow Shots           U, D, U, D, R, U, C, C, C, C, D 
Baby Mode               S, C, and keep repeating 

Extended Rosters
     When  you  select  your  team,  press  Select  and move the D-Pad
counterclockwise  twice.  You  will see the message "Extended Rosters"
on-screen if done correctly.