Sudoku puzzle book

Sudoku puzzle book, the ideal book for those who have a spine, are selective people and want something soft for training the mind and the intellectual. Improve your game with this three-level card. build your logic and problem-solving skills - and have fun along the way - with this sudoku puzzle book!Four difficulty levels will keep you busy and train your focus for hours on end. Because each puzzle is spread over an entire page, solving these puzzles will be easy for your eyes - but not for your brain!