with this great collection of sudokus, including over 500 challenges across four difficulty levels (Warm-Up, Challenging, Tough, and the ultimate Samurai Sudoku!) A must-have for all Sudoku enthusiasts. Expertly crafted with accurate skill levels Includes instructions, techniques and pro tips for beginners Answers for every Sudoku included in back Easy to tear out, thanks to wide margins Size of the book: 8.5 X 11