A fast, fun puzzle collection designed for busy minds who want a quick brain boost anytime, anywhere. Only got 5 minutes? This collection of 120 sudoku puzzles with a handy ball-point pen is perfect for puzzling on the go. Spanning across a number of difficulties, these puzzles are the perfect way to keep yourself entertained and your brain engaged during a spare few minutes. • WITH BALL-POINT PEN : Includes a pen for easy puzzle solving on the go. • FOUR DIFFICULTY LEVELS : For puzzles of every level, with whatever time you have. • 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.