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*Book41*Vol.41"*": "*"A* SUDOKU*PUZZLE*200 Challenging*Puzzles with Answers*Book41*Vol.41"*": Lopez, Champ: 9781543255256: Amazon.com: Books
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