Sudokus are the ever-popular number placement puzzles that give your brain a workout. Work your way through the difficulty levels or jump in at a level of your choosing. Presented in an easy-to-read large-print type and a lovely bumper hardback package this collection is sure to keep you entertained for hours.• HARDBACK FORMAT: This hardback puzzle book provides a durable, lie-flat format with a premium feel. • LARGE PRINT: Put your reading glasses away! This large-print book allows you to puzzle away without straining your eyes. • OVER 400 PUZZLES: This bumper book provides hours of puzzling fun. • 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.