For example, the shield power-up lasts longer when a Courage Geon uses it, and the Envy and Melancholy Geons get more mileage out of the power-ups that make little tornados or pits. There are eight Geon emotions in all, but they aren't swappable - the one you choose is the one you're stuck with. Again, not entirely unlike a girlfriend or any other kind of significant other.
There are some mini-games and a time trial mode as well, but the real meat and potatoes of Geon is that one-on-one, cube-to-cube action. And it looks okay; very stylish. The biggest problem is that it just lacks the single-player appeal of a Pac-man, as well as the multiplayer depth and longevity of a game like Bomberman. And when both Pac-man and Bomberman are available on LIVE, that makes Geon tough to recommend, let alone single out as original and innovative.