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It consists of a 9x9 grid divided into nine 3x3 subgrids, also known as "boxes," "blocks," or "regions." The objective is to fill the grid with digits so that each column, each row, and each of the nine 3x3 subgrids contain all of the digits from 1 to 9. extremely hard sudokusudoku 99 Look for missing numbers: Start by identifying rows, columns, or boxes that are missing a particular number. However, the primary difference lies in the presence of skyscrapers, which are represented by the tall buildings in the grid. sudoku master online
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