John Voorhees, MacStories:

Zach Gage has a knack for giving classic games an interesting twist. Sometimes that means turning the rules upside down and inside out like Flipflop Solitaire or Really Bad Chess. Other times, it means removing the tedious and boring parts of games to breathe new life into them, which is precisely what he and Jack Schlesinger have accomplished with Good Sudoku.

Follow the headline link for John’s review. I’ve been playing the hell out of the beta and I can tell you personally:

• It’s become the number one played game on my iPhone
• It’s a great way to learn how to solve a Sudoku

Download Good Sudoku for free, $3.99 to unlock the whole thing.

If you are into puzzles, this is money well spent.