## Sudoku

Su·doku 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: the puzzle originates with some squares already filled in, with the number of filled-in squares determining the level of difficulty

Origin of Sudoku

Japanese ; from*s?*, number +

*doku*, single: shortened ; from

*s?ji wa dokushin ni kagiru*, numbers must be single, name origin, originally used in Japan (1980s) for “Number Place,” puzzle originating in the United States (1979)

## sudoku

noun

A puzzle in which a grid consisting of several regions is to be filled with numbers so that every row, column, and region contains only one instance of each number. The most common format is a grid of nine rows and columns that are divided into nine smaller regions of three rows and three columns into which the numbers 1 through 9 must be placed.

Origin of sudoku

Japanese*sūdoku*, contraction of

*sū(ji wa) doku(shin ni kagiru)*,

*the numbers are limited to a single occurrence (the phrase under which sudokus appeared in a magazine which popularized them in Japan in the 1980s)*:

*sū(ji)*,

*number*+

*doku(shin)*,

*single*.

## sudoku

Noun

(*plural* sudokus)

- (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.

Origin

Japanese æ•°ç‹¬ (sÅ«doku), numbers singly