You don't need to be a math whiz to enjoy a great sudoku puzzle! Sharpen your mind and have some fun with this great collection of sudokus, including over 540 challenges across four difficulty levels (Warm-Up, Challenging, Tough, and the ultimate Samurai Sudoku!) A must-have for all Sudoku enthusiasts. - OVER 80 SUDOKU & SOLUTIONS: Hours of fun and entertainment to enjoy! - LAY FLAT: Spiral-bound lays flat for ease of use at home...