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Noun
sudoku
Definition: a number puzzle in which the numbers 1 through 9 must be placed into a grid of cells so that each row or column contains only one of each number
Definition: A type of pencil puzzle played on a square grid, requiring each of the columns, each of the rows, and each of the subregions (called "boxes" or "regions") to contain the lowest whole numbers up to the dimension of the puzzle, usually 1 to 9, once each. The subregions are rectangular or square except in variants.