The Ultimate Challenge Sudoku Puzzle Book Grab this massive bargain bonanza of classic Sudoku puzzles of varying difficulty levels, expertly crafted and graded. - 100 Medium puzzles for intermediate players or as a warm up for experts 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