Sudoku Puzzle Book 500 Extra Hard Puzzles: No Wasted Puzzles With Only One ...
Title: Sudoku Puzzle Book 500 Extra Hard Puzzles: No Wasted Puzzles With Only One Level Of Difficulty. Author: Master, Sudoku Puzzle (Author). Binding: Paperback, Paperback. Weight: 0.93 lbs. Publication Date: 2017-02-22.