Fitness for Your Brain

This Sudoku book is packed with the following features:

102 Hard to Extreme Sudoku PuzzlesOne puzzle per page (8.5 x 11 inches) and large print font for prevention of eye-strainAnswers 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 4 are sorted into three levels of difficulty (hard, very hard and extreme).