<p>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.<br>•<b> IMPROVE YOUR SOLVING SKILL:</b> 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.<br>•<b> EXERCISE YOUR BRAIN:</b> Give your mind a great workout as you find where each missing number fits.<br>•<b> REDUCE STRESS:</b> Feel your stress melt away as you focus on these satisfying puzzles.</p>