Hexadoku (16x16 Sudoku): for Seniors, Adults, Problem-solvers, Stroke Survivors, Smart Teens (Think-It-Through™ Book Series): Amazon.co.uk: Boff, Ansilo: 9798378434480: Books
Hexadoku - Play The 16x16 Sudoku Variant - Mastering Sudoku
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Large Print Sudoku 16x16 - 100 Hard Puzzles: Very Difficult Hexadoku with Solutions - Sudoku Variant Puzzle Book for Adults (Large Print / Paperback) | Greenlight Bookstore
100 Sudoku Puzzles Book 16 x 16 Grid: Enjoy Solving Normal Difficulty Hexadoku for adults and kids (solutions included): Art, Xoox: 9798527462319: Amazon.com: Books
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Large Print Sudoku 16x16 - 100 Hard Puzzles: Very Difficult Hexadoku with Solutions - Sudoku Variant Puzzle Book for Adults by Oliver Hammond, Paperback | Barnes & Noble®