Backyard Football (GameCube)
CheatingDome.com
Get the Cereal Bowl stadium
Win the cereal bowl championships.
Instant Fumble
To cause a fumble, tackle them perfectly straight behind or front with a charge.
Make Players Invisible
Go to the main menu and press Z to get the code screen and put in GHOST as a code.
Useful Moves
Press L and R to fake them out.
Walter Payton
Go to season mode and type in Walter Payton as the coach name and pick any team and he will be on your team. This will only work in season mode.