What's the noun for sudoku? Here's the word you're looking for.
sudoku
(game) A type of puzzle whose completion requires each of typically nine rows and columns and each of as many usually square subregions to contain, without duplication, the digits from 1 to 9 (or the grid dimension).
“I spent my Saturday morning completing a challenging sudoku puzzle, ensuring that each row, column, and subregion contained the digits from 1 to 9 without duplication.”
“So I was doing some sudoku the other day when I noticed the similarity to John Dee's Enochian tables, and magic squares in general.”
“A few weeks ago, I printed up some sudoku puzzles and brought them with me to Cambridge Common.”
