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Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid contain all of the digits from 1 to 9.
Start by looking for the most crowded rows or columns. If a row has 8 numbers filled in, logic dictates there is only one possible number left. This is called 'scanning'.