Sudokus are the ever popular number placements puzzles that give your brain a workout. Spanning across a number of difficulties, this stylish collection is sure to keep you entertained for hours. - 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.