Sudokus are the ever-popular number placement puzzles that give your brain a workout. Spanning five levels of difficulty to appeal to beginners and experts alike! This collection comes in an elegantly designed package making it perfect gift for yourself or others. - EXERCISE YOUR BRAIN: Give your mind a great workout as you pit your wits against these number-placement teasers. - REDUCE STRESS: Feel your stress melt away as you focus on these satisfying puzzles. - GIFT EDITION: Designed with a stylish cover, this collection would make a brilliant gift for all puzzle-lovers out there.