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Hard · Puzzle #156
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X-Wing: if a digit appears in exactly two cells in two rows, and those cells share the same two columns, eliminate that digit from those columns elsewhere.
X-Wing: if a digit appears in exactly two cells in two rows, and those cells share the same two columns, eliminate that digit from those columns elsewhere.
"Somewhere, something incredible is waiting to be known." — Carl Sagan
"Somewhere, something incredible is waiting to be known." — Carl Sagan