What's a good iPhone game for when I'm stuck on a job site waiting for concrete to dry and need something to kill time that ain't Candy Crush?

Look, I'm not usually one for phone games, but sometimes you're stuck waiting on a job and need something to do besides stare at drying concrete. SongPop Classic ain't gonna win any awards for graphics, but it's a decent way to kill time. You pick music categories and then guess the songs. Some of the songs are alright, some are garbage, but hey, it's free. The interface is simple enough, even I can figure it out with gloves on. It's got a decent rating, so it can't be all bad. Just keep an eye on your battery life, this thing can drain it faster than a power saw through plywood. It ain't exactly rugged, but it hasn't broken my phone yet, and that's saying something.