Sudokus are the ever-popular number placement puzzles that give your brain a workout. With a number of difficulty levels to try your hand out, you can watch your skills improve as you go! This collection comes in a handy pocket-sized package so you can pop it in a bag for puzzling fun on the go. • 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. • POCKET-SIZED: This handy layout is perfect for carrying on your travels or just to keep by your bedside.