Chameleon Run
Chameleon Run might be the perfect summer time waster. I'm a sucker for games I can play in the waiting room at doctor's offices, or just while wanting to kill five minutes.
The premise is that as you run, you are matching the runners character with the platform you are landing on. Right tap makes you jump, and left tap changes color. Maybe I'm wrong, but it seems like some serious left brain/right brain action going on. Either way, it's a lot of fun!
Get Chameleon Run on the App Store for $2.