Sorry, there are no known Backyard Baseball GBA cheats published yet. If you know of any cheats for Backyard Baseball, please submit them on CheatCodes.com for a chance to win a free Game Boy Advance game (or any other game you want)!
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We have Backyard Baseball cheats for PlayStation 2, PC, Game Boy Advance, and GameCube on CheatCodes.com. Give them a try, since cheats for other game systems sometimes work on Game Boy Advance games, too!