Sudokus are the ever-popular number placements puzzles that give your brain a great workout. Spanning a number of difficulty levels, this collection comes in an elegantly designed package with a textured cover and gold foil accents, making it the perfect gift for any puzzle lover.• 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.• POCKET-SIZED: This handy layout is perfect for your travels, pocket or bag, or just to keep by your bedside.