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Logical book. Killer sudoku. Chain puzzles. Easy - medium levels.: For adults and children. (Killer sudoku and his friends): Holmes, Basford: 9781088476055: Amazon.com: Books
Killer Sudoku Medium 200 Puzzle WIth Solution Vol 1: Advanced Puzzle Sumdoku Book,9x9, 2 puzzles per page: Sumdoku, Tewebook: 9781701152304: Amazon.com: Books