Crossword Genius

Logic-based number-placement puzzle whose name means "single number" (6)

Ross

I believe the answer is:

sudoku

(Other definitions for sudoku that I've seen before include "numbers in boxes" , "Popular logic-based puzzle" , "Number placement puzzle with a 9 x 9 grid" , "Numeric puzzle" , "filling boxes" .)

I've seen this clue in The Independent.
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