Sudoku fanatics will love this book! In fact, once they know about it, they won't be able to live without it for another day. 200 extremely difficult, hair-tearing puzzles at an irresistibly low price point $2 below the market average makes this a must-buy item for the legions of sudoku fans who can't buy enough challenging puzzles. Tougher puzzles, more of them, and a better price by a master solver? Ring it up! As opposed to other popular books, all sudoku puzzles presented are hand done by the author for consistency and quality,they are not computer generated.