The best thing about this version of Sudoku is that it teaches you to make your game better. Ive played Sudoku for a few years, but have never learned more than when I use Hints and Learn from this application. My times are consistently better and my solving abilities have gotten much sharper. This version takes advantage of technology, both on the iPad and Mac, so that finding isolated numbers is easy, which gets you on your way to solving the puzzle. Want to make it more difficult? Turn the feature off! Im also a fan of filling in the pencil marks, since thats my weakest area of the game. I may have to do that when Im playing the USA Today or NY Times puzzles, but with Sukoku, I can do a fast game by having the hints populated for me. I have only a couple criticisms. First, I wish pencil marks worked on the Mac the way it does on the iPad. Clicking a checkbox is clunky compared to just hitting a dedicated row of pencil buttons. Second, do something about the home screen photo and title font. It looks very sophomoric. Lastly, with the iPad app, you can use the camera to scan in puzzles. I wish the Mac app could read a screen capture of an on-line puzzle. That would be helpful! You wont go wrong with this application, youll have hours of fun, and I guarantee youll learn more about Sukoku logic that you knew before you purchased it!