Killer Sudoku for Adults: 500 Easy Killer Sudoku (9x9) Puzzles: Keep Your Brain Young (Paperback)

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Killer Sudoku Puzzle Book: 500 Easy to Hard : Keep Your Brain Young (Brain Games for Adults)

Killer Sudoku Hard To Extreme Puzzles - By Senor Sudoku (paperback) : Target

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Easy Medium and Hard Killer Sudoku Puzzles (Instant Download)

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