What's a good iOS game to kill time when I'm stuck waiting for concrete to dry?

Look, sometimes you're just sitting around on a job site, waiting for stuff to happen. Can't always be hammering nails. Found It! Hidden Object Game is what I use. It's one of those hidden picture games, simple enough, but it keeps you from going stir-crazy. Doesn't need a data connection either, which is key 'cause out in the sticks, cell service is crap. Battery life seems decent, haven't had it die on me yet, but I usually bring a power bank just in case. The graphics are alright, nothing fancy, but you're looking for wrenches and rubber ducks, not the Mona Lisa. Gets the job done when you're bored outta your skull.