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Killer sudoku help: supposedly the red squares MUST be 6/7/8/9 adding to 30 (swipe to see the hints), but according to my derivation, the red squares can sum anywhere between 25-30 : r/sudoku
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Mensa Killer Sudoku: More than 200 of the most difficult number puzzles: Moore, Dr Gareth, Mensa Ltd: 9781802791846: Amazon.com: Books
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Killer Sudoku for Experts, Book 1: 200 Mind-bending Puzzles: Macmillan, Robert, Macmillan, Ella: 9798686206441: Amazon.com: Books
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