Sudoku X Puzzle Book

The objective of Sudoku X is to fill every row, column, diagonal and box (3x3grid) with numbers 1-9 and each row, column, and box must have each number exactly once.
This Sudoku book is packed with the following features:
500 Easy to Hard Sudoku X PuzzlesAnswers to every puzzle are provided at the back of the book.Each puzzle is guaranteed to have only one solution.Includes free bonus puzzles you can download book (Tons of Sudoku Puzzles for Adults & Seniors) Includes free bonus puzzles you can download book (Word Search With Hidden Message: 102 Puzzles for Adults and Seniors) SUDOKU X Puzzle Book is a collection of 500 sudoku puzzles. Part of the popular "Brain Games for Adults" series, the book is designed to help keep your brain cognitively fit, flexible, and young.
SUDOKU X Puzzle Book are sorted into three levels of difficulty (easy, medium and hard).