Observer killer sudoku
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Guardian -- 3 years before
Guardian -- 3 years before
Guardian -- 3 years before
Fifteensquared -- 3 years before
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Big Dave's Crossword Blog -- 3 years before
Big Dave's Crossword Blog -- 3 years before
/r/crosswords Subreddit -- 3 years before
Fifteensquared -- 3 years before
/r/crosswords Subreddit -- 3 years before
The Crossword Centre -- 3 years before