The Ultimate Travel Format Sudoku Puzzle Book This book has a smaller size than most Sudoku books and is ideal for carrying with you in your bag or backpack when you are on the go. It contains a collection of 200 classic Sudoku problems, expertly designed and graded: 100 Medium and 100 Hard puzzles. That makes it suitable for all addicts of this brain-bashing game, kids and adults alike. We've had your entertainment and convenience in mind when designing this book and thought about the small details which make a difference: Wider center margins making it easier to work on the puzzles when you fold the book Larger font and better quality paper than newspapers and magazines - easy to write on without worry of bleed through Problem levels has been expertly assessed for consistency. No wasted puzzle in this book. 2 problems per page and solutions at the end of the book Includes a FREE Bonus book This book with hours of fun inside also makes a great gift!