Give yourself a real challenge with this book containing 200 diabolical puzzles. With 100 very hard and 100 extremely hard puzzles to really keep you occupied. Makes a great gift for sudoku enthusiasts! Features: 200 9 x 9 sudoku puzzles Two puzzles per page Handy size 6" by 9" book with plenty of space for notes Solutions at end of book Numbered pages and puzzles Glossy wipe clean cover