sudoku
noun /suˈdəʊkuː/, /suˈdɒkuː/
/suˈdəʊkuː/
[countable, uncountable]- a number puzzle with nine squares, each containing nine smaller squares, in which you have to put the numbers one to nine so that a number appears only once in each of the nine squares and in each row of nine across and down the puzzle
enlarge image- He passes the time doing sudokus.
- There are sudokus at four levels of difficulty.
