Is Sudoku free to play?

Yes. Sudoku runs in a browser at no cost, with nothing to install and no purchase to make.

How often does Sudoku reset?

Once a day. Everybody gets the same puzzle, and a new one replaces it when the game's day rolls over.

On greatest.games, and you can play it inside this page without leaving Alldle.

It sits in Logic & Math, alongside the other daily games of that kind in the catalogue.

Logic & Math 16 plays

Every row, column and 3x3 box takes the digits one to nine, once each.

Sudoku

Logic & Math

Is Sudoku free to play?: Yes. Sudoku runs in a browser at no cost, with nothing to install and no purchase to make.
How often does Sudoku reset?: Once a day. Everybody gets the same puzzle, and a new one replaces it when the game's day rolls over.
What languages does Sudoku support?: English.
Where does Sudoku run?: On greatest.games, and you can play it inside this page without leaving Alldle.
What kind of game is Sudoku?: It sits in Logic & Math, alongside the other daily games of that kind in the catalogue.

If you play Sudoku, the closest things to it in the catalogue are Shikaku of the day, Clues By Sam and Seedle. They sit in the same logic & math category. See the full list of alternatives.