The Ultimate Challenge Sudoku Puzzle BookGrab this massive bargain bonanza of classic Sudoku puzzles of medium difficulty levels, expertly crafted and graded.100 Medium puzzles for intermediate players or as a warm up for expertsThis 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 bookThis also makes it easy to tear out the pages if you want toBigger font and better quality paper than newspapers and magazines - easy to read and write on without worry of bleed throughProblem levels has been expertly assessed for consistencyGrids are large and easy to seeGreat for exercising your mind and increasing cognitive abilitySolutions included.An excellent gift for anyone who loves puzzles and activity book as well as challenging their mind!