Puzzlers of all ages will love these challenging sudoku puzzles. Sudoku is a great way to build logic and problem-solving skills. Contains over 200 sudoku puzzles divided into five difficulty levels: Easy, Medium, Hard, Difficult, and Expert. Whether you're a master puzzler or a novice, there are plenty of puzzles inside to challenge everyone, in a convenient portable size. A spiral spine allows the book flat. 256 pages.