There’s something innately addictive about the type of game where your character is constantly in motion and you have to keep them safe from whatever traps their surroundings hold. These games tend to work pretty well on the iPhone, but like any other genre that trick is to come up with something that’s different than everything else the user has played. Fluttr does a pretty good job of that. Instead of a running creature you must protect a butterfly. More importantly, though, is that instead of directly controlling the character you control the environment.