The Rule of 45 of Killer Sudoku (innies and outies)

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This tip is probably the most important solving technique of Killer Sudoku, one that will save you a lot of time. It does involve some math, but very simple one. Basically, the whole story is that …
The Rule of 45 of Killer Sudoku (innies and outies)
How does this work? : r/sudoku
The Rule of 45 of Killer Sudoku (innies and outies)
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The Rule of 45 of Killer Sudoku (innies and outies)
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The Rule of 45 of Killer Sudoku (innies and outies)
Calcudoku puzzle forum - View topic - killers too difficult?
The Rule of 45 of Killer Sudoku (innies and outies)
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The Rule of 45 of Killer Sudoku (innies and outies)
How to go from here : r/sudoku
The Rule of 45 of Killer Sudoku (innies and outies)
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The Rule of 45 of Killer Sudoku (innies and outies)
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The Rule of 45 of Killer Sudoku (innies and outies)
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The Rule of 45 of Killer Sudoku (innies and outies)
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The Rule of 45 of Killer Sudoku (innies and outies)
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