Wait for the words "Press Start" to begin flashing on the title screen. Then press:

C-Up, C-Up, C-Down, C-Down, C-Left, C-Right, C-Left, C-Right, B, A. Then hold the Z button and press start; you'll hear the announcer shout to confirm the code. Now start the game and all of the players on both teams will have huge heads.

At the Title Screen enter the following code:

Up, L, Up, L, Down, L, Down, L, Left, R, Right, R, Left, R, Right, R, B, A (the directions should be done on the D-pad). Now hold Z and press start.You should get 5 All Star teams in Open Games!