Meaning of “sudoku” in the English Dictionary

british dictionary

"sudoku" in British English

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sudokunoun [ U or C ]

/suˈdəʊ.kuː/ us /suˈdoʊ.kuː/

a number game in which you have to write a number between 1 and 9 in each small box of a 9x9 square

(Definition of “sudoku” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)