Is this Sudoku free?
Yes. Every puzzle is free to play without an account or payment. When advertising is enabled, it stays in reserved spaces after the game area.
How it works
Logic, not arithmetic.
Fill every row, column, and 3 × 3 box with the digits 1 through 9. Each digit appears exactly once in each group.
Use Notes for candidates, Check only when you want feedback, and Hint when you want the next logical idea rather than the answer.
Common questions
Does each puzzle have one solution?
Yes. Published Sudoku puzzles are checked by the same uniqueness solver used in the release pipeline.