Book of 200 Puzzles is sure to provide hours of stimulating gaming for Sudoku fans. The 200 puzzles increase in difficulty, from Beginner to Advanced, ensuring a challenging, brain-boosting Sudoku game for all skill levels. Book of 200 Puzzles makes an exciting gift for all Sudoku players, from beginners to experts. -200 unique Sudoku puzzles -4 difficulty Beginner, Novice, Intermediate, and Advanced -Answers to the puzzles are included -A great way to sharpen the mind