? Learn to play sudoku! ?The perfect app for sudoku beginners! Learn to play gradually by starting with small puzzles and working your way up. An in-game help feature uses pictures to make the rules easy to understand. The level of difficulty increases gradually through nine different levels. Before you know it, you have learned sudoku!Comes with 60 free puzzles for learning to play. More puzzles are available with a paid upgrade.? Nine levels of difficulty? In-game explanation of the rules? Puzzle book view shows your progress? Three puzzles sizes (4x4, 6x6, and 9x9)? 4500 puzzles available (60 are free)? Great mental exercise!