Observer killer sudoku | Life and style | The Guardian
I got to this state of the daily killer sudoku rather quickly, but I've been stuck on this state for an hour now. What am I missing? How do I proceed? :
Observer killer sudoku | Life and style | The Guardian
Letter Killer Sudoku (Daily Sudoku League #70)
Observer killer sudoku | Life and style | The Guardian
Observer killer sudoku | Life and style | The Guardian
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