The Virgin Book of Killer Sudoku: Virgin Books: 9780753511589: Amazon.com: Books
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Greater than Sudoku
Greater than Killer-Sudoku by Mayuri Gujrathi
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Killer sudoku and Kin-kon-kan medium levels.: Sudoku puzzles mid-level book. (Paperback) de Basford Holmes: New Paperback (2019) | The Book Depository