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sudoku

[soo-doh-koo]
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noun
  1. a puzzle printed on a square grid of nine large squares each subdivided into nine smaller squares, the object of which is to fill in each of the 81 squares so that each column, row, and large square contains every number from 1 to 9.
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Origin of sudoku

2000–05; < Japanese sū- (< sūji number) + -doku (< dokushin being single)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for sudoku

sudoku

noun
  1. a type of puzzle in which numbers must be arranɡed within a ɡrid contaninɡ several internal squares so that no number is repeated in the same row, column, or internal square
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Word Origin

C21: from Japanese su number + doku single
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012