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Killer Sudoku and His Friends: Adult sudoku jigsaw Killer. Calcudoku puzzles. Extreme levels.: Sudoku for home and tourism. (Paperback) - Walmart.com
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400 classic Killer sudoku 9 x 9 + BONUS 250 Hidoku puzzles: Sudoku with EASY, MEDIUM, HARD, VERY HARD level puzzles and a Hidoku 9 x 9 very hard level a book by Basford Holmes
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