CheatCodes.com has all the official Mario Tennis: Power Tour GBA cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Saturday May 18, 2013 for Mario Tennis: Power Tour are shown below.
Start a power tour then after you talk to ace or clay go to the pipes and jump in to the one on the left, you will come out with a green mushroom. Than mushroom will give you a level up. NOTE: this can only be done once.
To get a Free Level Up, after you beat mario in Singles go to the senior class and go to the Soda machine. Go up to the soda machine and press A and you will get a free level up. Also once you beat Varsity Training classes you can go to the pond and there will be a sign. Press A while at the sign and you will start having to swing your Racket. If you swing it at least 100x's within 10 seconds, and a fairie will appear and she will give you aa free Level Up.
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