Sudoku Puzzle Book, 400 Puzzles, 100 Easy, 100 Medium, 100 Hard and 100 Extra Hard: Improve Your Game With This Four Level Book

Relieve boredom and stress by playing Sudoku. With four levels of increasing difficulty this economical Sudoku Puzzle Book is designed to gradually improve your game. There are 4 puzzles per page and solutions are at the end of the book.