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Definition of Sudoku
1. Noun. 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 of Sudoku
1. Noun. (games puzzles) A type of puzzle whose completion requires each of typically nine rows and columns and each of as many usually square subregions to contain, without duplication, 1 up to 9 or the grid dimension. ¹
¹ Source: wiktionary.com