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 levels (Killer classic
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![By Lea Rest 200 Killer Sudoku 1 [Paperback]: Amazon.com: Books](https://images-na.ssl-images-amazon.com/images/I/412AZRDFcoL._SX331_BO1,204,203,200_.jpg "By Lea Rest 200 Killer Sudoku 1 [Paperback]: Amazon.com: Books")
By Lea Rest 200 Killer Sudoku 1 [Paperback]: Amazon.com: Books
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