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Tatami Puzzle Book 2: 200 Hard Puzzles: Quinlan, Kenneth, Publishing, WMC: 9781660916795: Amazon.com: Books
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Luxury Logic Puzzles — Killer Sudoku: 200 Hard Puzzles: Linklater, Felix, Genius, Puzzle: 9798798976843: Amazon.com: Books
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2022 Sudoku: 365 Hard Puzzles for Every Day of the Year : Keep Your Brain Young (Calendar Puzzle Books Series): Alzamili, Dr. Khalid: 9798462365812: Amazon.com: Books
Hard Logic Puzzles & Brain Games for Adults: 500 Puzzles & 12 Puzzle Types (Sudoku, Fillomino, Battleships, Calcudoku, Binary Puzzle, Slitherlink, ... (Challenging Fun Brain Teasers Series): Alzamili, Dr. Khalid: 9789922636092: Amazon.com: Books
Binary puzzle book for Adults: 400 Very Hard Puzzles Mixed Grids (Volume 26): Gurin, Alena: 9798722142894: Amazon.com: Books
501 Really Hard Sudoku Puzzles: Jones, Louise: 9781933819884: Amazon.com: Books
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