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400 classic Killer sudoku 9 x 9 MEDIUM - HARD + BONUS 250 Hidoku puzzles: Sudoku with Medium, Hard levels puzzles and a Hidoku 9 x 9 very hard levels (Killer classic sudoku 9 x 9): Holmes, Basford: 9781727300802: Amazon.com: Books
A SUDOKU Puzzle"*200 Challenging Puzzles with Answers Book30 Vol.30"*": "*"A SUDOKU Puzzle"*200 Challenging Puzzles with Answers Book30 Vol.30"*": Lopez, Champ: 9781543219616: Amazon.com: Books
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