Hard Sudoku Puzzle Book for Adults: 200 Large Print Puzzles: Andrews, Kat, Plus, Puzzle Books: 9781732752047: Amazon.com: Books
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100 Hard X-Wing Sudoku: Media, Clarity: 9781728814667: Amazon.com: Books
Sudoku Hard 500 Puzzles: Sudoku Puzzle Book - 500 Puzzles and Solutions - Hard Level - Volume 3. Tons of Fun for your Brain!: Puzzles, BeeBoo: 9781691812110: Amazon.com: Books
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