I'm proud to present the latest update for my Sudoku app: version 1.8 is now live and features Game Center support. Almost a dozend achivements are waiting for you to explore!
The app is live for about a week now and has a 5 star rating on the app store. Previous updates brought a timelapse features and a new difficulty setting ("expert") with even harder grids to solve. And I introduced a tutorial mode to guide you through every sudoku.