Crossword Genius

Numbers puzzle with 81 squares (6)

Ross

I believe the answer is:

sudoku

(Other definitions for sudoku that I've seen before include "Number placement puzzle with a 9 x 9 grid" , "filling boxes" , "Japanese number puzzle" , "9 x 9, 1-9 puzzle" , "Numerical puzzle" .)

I've seen this clue in The Guardian.
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