What's a good iPhone game to kill some time while waiting for my suppliers to get back to me?

Look, I need something to keep me occupied when I'm on hold or waiting for emails. Screw Away is a decent little puzzle game. It's got these 3D pin puzzles, and you gotta figure out how to unscrew everything in the right order. Sounds simple, but it can get tricky, which is exactly what I need to take my mind off things for 10-15 minutes. I'm not looking for some massive time sink; I've got a business to run. But for a quick distraction that doesn't require a ton of brainpower or a huge time commitment, it's worth a download. Plus, it's free, so the ROI is already lookin' good. Bottom line: it gets the job done when I need a quick mental break.