Sorry, there are no known MLB '09 PS3 cheats published yet. If you know of any cheats for MLB '09, please submit them on CheatCodes.com for a chance to win a free PlayStation 3 game (or any other game you want)!
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We have MLB '09 cheats for PlayStation 2, PSP, and PlayStation 3 on CheatCodes.com. Give them a try, since cheats for other game systems sometimes work on PlayStation 3 games, too!