All what I can say:
Idea of combining RPG elements with tennis game is great. Overall there are many mini games, which are used to boost your and your co-player levels. Also you have to teach power shoots and saves, which can be used as advantage.
Story line is interesting and requires you to go trough different ranks to unfold the story. Also as most other GBA games, you can link up to 4 GBA to play a game together with your friends.
In my opinion this game deserves only 10 out of 10 points, and ait’s worth every penny.
