Rules: The grid is divided into nine 3x3 subgrids, known as "boxes" or "blocks." Each row, column, and box must contain the digits 1 to 9 without repetition. extremely difficult sudokusudoku y wing Hidden Pairs and Triples: Similar to naked pairs and triples, hidden pairs and triples are when two or three cells in a row, column, or subgrid have the same two or three possible numbers, but these numbers are not adjacent.
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