Billed as the next crossword, Sudoku's simplicity is its beauty. Although it is a number game, Sudoku requires no mathematical skills - just a keen grasp of logic and plenty of patience. Ninja Sudoku Puzzle Book Volume 1 is packed with puzzle-solving fun for the whole family. You'll get over 200 Sudoku puzzles ranging from easy to challenger - sure to please beginners and seasoned solvers alike