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Sudoku X: 250 Medium to Hard Sudoku Diagonal Puzzles (Diagonal Sudoku): Mindful Puzzle Books: 9781088882948: Amazon.com: Books
Amazon | Sudoku 6 x 6 - 250 Even - Odd Puzzles - Diagonal - Silver: Simple and tasteful (6 x 6 PITSTOP) | Pitenko, Andrii | Puzzles
Amazon | 5 Golden SUDOKU - Champion level - Very hard - Vol. 28: 50 Not five not ten - "X" Diagonal - Central Points + 50 Killer "X" Diagonal Octagonal Star +