Deluxe Big Book of Sudoku For Adults with 500 Puzzles from Hard to Expert Level. Sudoku is perfect for a daily brain gymnastics to improve memory. Our Sudoku book is not only a puzzle book but also a beautiful book. It is a real pleasure to offer it to beloved persons, your parents, grandparents or any Sudoku lovers . It has been elaborated with the utmost care to make its use as pleasant as possible. Do not hesitate to have a look at the cover or consult the preview of the illustrated book interior. In our Sudoku books, no need to search the solution at the end of the book. With our exclusive and innovative design, all solutions are directly accessible in the same page as the grids. Hard to Extreme level Sudoku are ideal to train your brain and stimulate memory. All Sudoku puzzles in our books are 100% originals and certified . They have been generated by our own internal grid generator and not using the market’s usual engine. Progressive level of difficulty is validated with Sudoku known solving methods. All techniques needed to resolve the puzzle determine the difficulty level. With our Sudoku book you will have: Big format book easy to hold - 300 Hard and 200 Expert Sudoku puzzles - 4 grids per page - Changing cell colors to better distinguish the blocks - Large print with 18pt characters - Floral illustrations on each page - Exclusive design with puzzles and solutions in the same page We wish you a nice Sudoku and hope that our efforts to meet the requirements of senior Sudoku players will suit you.