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Sudoku definition

Su·doku (so̵̅o̅ dō′ko̵̅o̅)

noun

a puzzle typically consisting of a large grid of 81 squares (9 across and 9 down) subdivided into 9 smaller grids of 9 squares (3 across and 3 down), with each of the squares to be filled in with the numbers 1 through 9 without repeating a number in any of the large grid's rows, columns, or smaller grids

Etymology: Jpn < sū, number + doku, single

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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