The Ultimate Challenge Sudoku Puzzle Book Grab this massive bargain bonanza of classic Sudoku puzzles of varying difficulty levels, expertly crafted and graded. There are plenty of puzzles to enjoy in this jumbo compilation, with 2 different levels of difficulty, which makes it suitable for intermediate and advanced sudoku players in love with this super addictive game: 500 Medium puzzles for intermediate players or as a warm up for experts 500 Hard problems which will give your brain a real challenge This book with hundreds of hours of fun inside makes a great gift! We've had your entertainment and convenience in mind when designing this book and thought about the small details which make a difference: Wide center margins making it easier to work on the puzzles when you open or fold the book This also makes it easy to tear out the pages if you want to Bigger font and better quality paper than newspapers and magazines - easy to read and write on without worry of bleed through Problem levels has been expertly assessed for consistency 6 problems per page and answers at the end of the book Includes a FREE Bonus book Your brain will thank you!