Ars writes: "Shivering Kittens is an iPhone game that you will absolutely need to download if you are a puzzle game type of person-especially if you want to truly understand how it works. We'll do our best to explain this addictive and challenging game here, but if you're anything like me, you probably won't fully understand it until you have played it a couple of times. That said, you'll probably be glad you did. There is both a "Lite" version, which is free, as well as a paid version, which costs $2.99. This review is about the paid version, though most of the comments also apply to the Lite version."