Meaning of “Sudoku” - Learner’s Dictionary

Sudoku

noun [ C, U ] (also Su Doku) uk us /ˌsuːˈdɒkuː/

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 Learner’s Dictionary © Cambridge University Press)