5000 Sudoku: Big Suduko Puzzle Book for Adults with 5000 Sudoku - Easy to Extreme Hard Puzzles - Vol 3: visugames: 9798595844956: Amazon.com: Books
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HARD TO EXTREME 1000 SUDOKU PUZZLE BOOK FOR ADULTS: Livingstone, Mark Anthony: 9798469311225: Amazon.com: Books
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3000 Sudoku: Suduko Puzzle Book for Adults with Hard to Extreme Hard Puzzles: visugames: 9798665156422: Amazon.com: Books
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Sudoku Puzzle Book 2100 Extreme Evil Level: Huge Collection Puzzles and Solutions, Expert Extremely Hard Sudoku Puzzles for Adults: West Group, Scott: 9798513052029: Amazon.com: Books
