The Classic Puzzles series is perfect for on-the-go, screen-free entertainment. Keep your brain engaged and active with this beautifully designed 160-page puzzle book, filled with sudokus ranging in difficulty from simple to diabolical. Packed with over 130 sudoku puzzles, these Classic Puzzles will test your deductive reasoning skills and keep you entertained for hours! Anyone can increase their brainpower at any stage of life!