Play Sudoku online
Sudoku asks you to fill a nine-by-nine grid with the digits 1 to 9. Every row, column and three-by-three box must contain each digit once. I included both a shared board and an online Sudoku race, so you can decide whether to help your friend or compete with them.
How to play
- Open Sudoku and choose solo, co-op or race before starting your puzzle.
- Select an empty cell and look at the numbers already in its row, column and box.
- Tap a number or type it with the keyboard to fill the selected cell.
- Use Notes to record candidates when several numbers are still possible.
- Keep resolving cells until the board is correct. In race mode, the first correct board wins.
Modes and a useful starting point
Available modes: solo play, online co-op with a friend, online race with a friend. A daily puzzle is available too.
Co-op shares edits on one grid; race gives each player a separate copy of the same puzzle. If you get stuck, the hint explains a technique and where to look before applying it. Work through an almost-complete row before making a guess.
Free in your browser, with no sign-ups and no ads.