Sudoku

Fill each row, column and 3×3 box with digits 1–9, each once. Select a cell and use the number buttons or your keyboard. Fixed clues cannot be edited. Notes track candidates; Hint fills the selected cell. Difficulty tiers use fewer clues, not a human-technique rating. Reloading clears your round.

Yes. Play the complete game in your browser without an account, download or purchase.

No. Each round runs on this device. Leaving or reloading the page starts a fresh game.