First there was Motion Math. Then Motion Math: Zoom. Now the family has grown to include Motion Math: Hungry Fish and Motion Math: Wings. Each game explores different math concepts in a way that takes great advantage of the iPod/iPad motion sensor and touch controls. All of them are either free or offer a free lite version. Full versions aren't that much more expensive (0.99 to 6.99). These games are on the better end of the math game scale, as they develop conceptual understanding through the use of visual representations of concepts and go much further beyond the math drill digital worksheet that many apps are.