Back Pocket™ Sudoku features a stylish cover making it a smart-looking package that also challenges. Packaged in a handy size, Back Pocket™ Sudoku easily fits into a pocket, brief case or laptop bag. Back Pocket™ Sudoku contains 100 addictive Sudoku puzzles and is perfect for puzzlers looking for a quick and engaging puzzle to complete. With more than 3 million copies in print, the Pocket Posh® puzzle series is a great way to exercise your mind-and look smart while doing it!