This is the developer here. I just released my first game this week! The lone IAP removes ads and gives customizable puzzle sizes. This game looks great on all devices from average-sized phones to the largest tablets. It's a fun logic puzzle game where all you need to do is place tiles. It has a much easier phone interface than Sudoku. This game is also known as kuromasu, kurodoko, etc. Here's a review http://www.slimgamer.com/20213/shirodoko-review-is-this-the-new-sudoku/ Download here: https://play.google.com/store/apps/details?id=com.Pondnetic.PNShirodoko
Just submitted an update for the iOS version. It only contains minor bug fixes however, so Android users aren't really missing anything. There is a problem with one of the middleware tools I'm using with Android but it will get sorted out eventually.
