Sudoku: 200 Challenging Puzzles to Keep Your Mind Sharp

Sudoku is a timeless number puzzle that is thought to keep the mind sharp and alert. The goal is to fill the 9x9 grid with numbers ranging from 1-9 without duplicating any number in either a row, column, or nonet.This book contains 200 puzzles ranging from easy to very hard and is complete with answers at the end of each section.Enjoy!