What's a good iOS game for killing time on a job site when the weather's got you stuck inside?

Look, sometimes you're stuck waiting for the rain to stop or the concrete to dry, and you need something that ain't gonna drain your battery in 10 minutes. Hideaways Wonders is a simple find-the-difference game. No complicated BS, just look at the pictures and tap what's different. The graphics are decent, easy on the eyes, which is good when you've been staring at blueprints all morning. It's not exactly Call of Duty, but it'll keep you from going stir-crazy. The music's alright, not too annoying. I'd say it's worth a download if you need something to kill time without needing to think too hard. Just don't expect it to be some life-changing experience. It's a time-waster, plain and simple, but sometimes that's exactly what you need when you're stuck on a job site with nothing else to do. And hey, it's free, so you can't complain too much.