Amazon | 200 Sudoku X Puzzles Diagonal Sudoku Book: Hard, Sudoku Variations, Standard 9x9 Grid with X Factor, Book 8, (6x9 in) (Sudoku Variants) | Pages, Lived | Sudoku
Amazon | Sudoku 6 x 6 - 250 Neighbors - Diagonal Puzzles- Silver: Book for your mood (6 x 6 PITSTOP) | Pitenko, Andrii | Sudoku
LUXE SUDOKU - Jigsaw killer puzzles - "X" Diagonal - 250 logical rebus -: Large Print + 50 Easy + 50 Medium + 50 Hard + 100 Very hard + Solutions + ... very hard - 9 x 9. (PITSTOP Puzzle Bonus): Pitenko, Andrii: 9781723255168: Amazon.com: Books