I recently bought Osmos, a neat physics-based game for the iPhone. The idea is simple: you control a circular mass by ejecting jets of matter to alter your velocity, reducing your own mass (and diameter) in the process. You can gain mass by “absorbing” other circles smaller than you, but are in turn absorbed if you bump into a mass larger than you. Very simple game to learn!
The objective depends on the level, ranging from “grow as big as possible” to “absorb a particular mass”. Some masses have different properties, acting as attractors or repulsors. Others have some intelligence and may try to escape from you or absorb you by steering themselves just as you do.
It may sound odd, but it’s a fun game, and well worth the $0.99 now that it’s on sale at the iTunes Store.