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Hard Killer Sudoku - 100 Challenging Puzzles: Sums Sudoku Puzzle Book for Adults - Very Difficult Sudoku Variant for Experts - Perfect Travel Companion: Hammond, Oliver: 9798598131442: Amazon.com: Books
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Killer Sudoku: 1,000 + New sudoku killer 10x10 : Logic puzzles easy - medium - hard - extreme levels (Series #25) (Paperback) - Walmart.com
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