Sudokus are extremely satisfying and enjoyable number-placement puzzles that give our brains a great workout. This brilliant collection includes over 300 puzzles is graded by level of difficulty from beginner to the experienced solver. IMPROVE YOUR SOLVING 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 Give your mind a great workout as you find where each missing number fits. REDUCE Feel your stress melt away as you focus on these satisfying puzzles.