Sudoku 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 sub-grids that compose the grid (also called "boxes", "blocks", "regions", or "sub-squares") contains all of the digits from 1 to 9. the puzzle setter provides a partially completed grid, which for a well-posed puzzle has a unique solution
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