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.

2000–05; < Japanese sū- (< sūji number) + -doku (< dokushin being single) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To Sudoku's 21st Century Lexicon
Main Entry:  Sudoku
Part of Speech:  n
Definition:  a puzzle consisting of a 3-by-3 grid of nine squares, each of which is similarly divided into nine smaller squares, some containing a number. The aim is to fill in numerals from 1 to 9 so that every horizontal and vertical line and every large 3-by-3 square contains only one instance of each number; also written sudoku
Example:  Sudoku has joined crosswords in most newspapers.
Etymology:  1980s
Main Entry:  sudoku
Part of Speech:  n
Definition:  See Sudoku's 21st Century Lexicon
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Example sentences
The gaming pioneer brings sudoku and other joys to non-gamers.
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