Ive have Enjoy Sudoku for the iPhone, iPad and Mac. I like the iPad version the best (likely because it is easy to set the number with your finger than using the trackpad). The Mac version is similar enough to the iOS version that you will pick it up right away. However the application does lag a little bit. It would be nice if it gave you the option to have the numbers in a row below the puzzle like the iOS version. I would be able to play the games quicker that way. What I really like about the developer of this application is that they frequently update their software with fixes and new features.