Keep your eyes and your brain sharp by playing classic Sudoku puzzles. These fun, addictive puzzles are easy to see and fun to solve! These puzzles help improve your problem solving and concentration skills. This book is organized from easy puzzles in the front then they get harder as you work your way towards the back of the book. - The perfect travel book- Suitable for all levels: beginner to expert- LOTS of puzzles: 160 Very Easy, 170 Easy, 180 Medium, 170 Hard, 160 Difficult & 160 Insane- Expertly crafted with accurate skill levels- Bigger print than in most newspapers and magazines (and with better paper)- Makes a great gift!