Amazon.com: Sudoku Puzzle Book for Adults, Young Adults and Teens: 1000 Sudoku Puzzles Easy to Hard including Standard Sudoku, Killer Sudoku, Sudoku Samurai, Marathon and more: 9798759732396: Publishing, BRIANTINKER: Books
Samurai Sudoku Puzzle Books for Adults: Japanese Math Puzzle Logic Book | Easy to Hard | 90 Puzzles: Publishing, Puzzle King: 9798674899709: Amazon.com: Books