200 Kakuro and 200 Killer Sudoku puzzles. Medium and hard levels.: Kakuro 9x9 + 10x10 + 16x16 + 18x18 and Sumdoku 8x8 medium + 9x9 hard Sudoku puzzles (Paperback) | Vroman's Bookstore
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Killer Sudoku : 80 Large Sudoku Puzzles: Sudoku for adults - 80 large sudokus puzzles with a 16x16 grid per page - Large print Sudoku (8.5 x 11 inches): Addict, Sudoku: 9798617592568: Amazon.com: Books
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Killer Sudoku: KILLER SUDOKU Vol. 31 : Collection of 100 different Killer Sudokus for Adults - Easy and Advanced - Perfectly to Improve Memory, Logic and Keep the Mind Sharp - One
Sudoku 16x16 by Vladimir Kussakov
Killer Sudoku : 80 Big Sudoku Puzzles: 80 sudoku with real challenge -16x16 sudoku - Large print Sudoku (8.5 x 11 inches) - Become a Sudoku Killer: Addict, Sudoku: 9798617594241: Books - Amazon.ca