Sudoku X Puzzle Books 16 x 16 Letters and Numbers - 100 Hard Puzzles Volume 1: large 8.5 x 8.5 inch Book Layout – 100 16 x 16 Sudoku X Puzzles - Bonus ... Puzzle Books 16 x 16 - 100 Hard Puzzles): Demarco, Christian: 9781081149871: Amazon.com: Books
The Super Sudoku Book For Smart Kids: A Collection Of Over 200 Sudoku Puzzles Including 4x4's, 6x6's, 8x8's, and 9x9's That Range In Difficulty From Easy To Hard!: Guido, Zack: 9781950601035: Amazon.com:
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2 X Travel Sudoku Books A5 Spiral Bound 4 Levels of Difficulty Each Book 9 10 for sale online | eBay