International Superstar Soccer 64
Big Head Mode

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.

All-Star Teams

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!