This Sudoku book is packed with the following features: - 102 Easy to Hard Sudoku Puzzles - One puzzle per page (8.5 x 11 inches) and large print font for prevention of eye-strain - Answers to every puzzle are provided at the back of the book. - Each puzzle is guaranteed to have only one solution. - Fitness for your brain: SUDOKU is a collection of more than 100 sudoku puzzles. Part of the popular "Large Print SUDOKU Puzzles" series, the book is designed to help keep your brain cognitively fit, flexible, and young. - Fitness for your brain: SUDOKU Puzzles Volume 1 Second Edition are sorted into three levels of difficulty (easy, medium and hard).