Crossword Genius

Number puzzle (6)

Ross

I believe the answer is:

sudoku

'number puzzle' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for sudoku that I've seen before include "Boxing contest" , "(Usually) nine-by-nine numbers puzzle" , "Puzzle involving the numbers 1 to 9" , "Numbers game" , "Numerical puzzle" .)

I've seen this clue in the King Feature Syndicate, The Independent, The Guardian, The Telegraph and The Times.
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