Hey..This is perfect Sudoku for all sudoku lovers. It has 10 different levels. Level 1 to 10 varies from very simple and easy to hard and toughest game play. Its best feature is no repetition of game. All puzzles are unique. Algorithm generates all puzzles randomly. The algorithm can generate millions of puzzles.2nd best feature is it can show your wrongly placed digits if asked to show. You can edit digits and place properly.It is optimized for fewer touches.Its 10 different levels helps novice players gain their confidence and for hard-core players it gives unlimited fun.Each time new puzzle is obvious a good thing which no other sudoku game offers..