Killer Sudoku Pro 2: 200 Puzzles

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Killer Sudoku: 1,000 + New sudoku killer 10x10: Logic puzzles medium - hard levels (Paperback)

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Variety Puzzle Books for Adults - 400 Normal Puzzles 9x9: Killer Sudoku, Killer Sudoku X, Killer Sudoku Jigsaw, Argyle Killer Sudoku (Volume 16) (Paperback)

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How do I even get started on this Killer Sudoku? : r/sudoku