This wonderful collection of sudokus is packed with more than 450 puzzles, making it a great treat for all fans of the popular number-placement challenge. • IMPROVE YOUR SOLVING SKILL: Each puzzle is graded, from beginner to expert, so you can enjoy the satisfaction of seeing your skill improve as you work through the levels. • EXERCISE YOUR BRAIN: Give your mind a great workout as you find where each missing number fits. • REDUCE STRESS: Feel your stress melt away as you focus on these satisfying puzzles.