For me it's Universe Sandbox. It's still kind of cool, and I knew it was more of a toy than a game when going in, but I dunno -- you'd think turning the sun into a black hole and throwing meteors at the earth would be more entertaining than this. The upside is it was only $2.49, so it's not a huge loss. Plus, it pads my list of games of Raptr that I'm highly ranked in, since it seems like most people don't play it for more than a couple of minutes. I was in the top 60% of players after half an hour of play...