Sudoku
A Sudoku race: everyone gets the same puzzle, starts on 3-2-1 and races to finish first while watching each other's progress. 1–20 players, about 6 minutes. Free in your browser, no sign-up.
Practice against the computerStart right away. Choose the strength
Sudoku in 30 seconds
- GoalEveryone solves the same puzzle; the fastest finisher ranks first.
- RuleNo number may repeat in a row, column or bold box.
- ProgressYou can't see other boards, only how much each player has filled.
- RankingFinishing order, then progress for anyone who timed out or quit.
To solve at your own pace, try numplace.com
At a glance
| Item | This game |
|---|---|
| Players | 1–20 players |
| Play time | About 6 min |
| Type | Board |
| Ranked play | No |
| Practice against the CPU | Yes |
| Price | Free (no account needed) |
| Rights holder | A public-domain classic game |
| Last updated | 2026-10-05 |
How to play Sudoku online with friends
- Tap "Play with friends"A party is created with a 6-character code. No account is needed.
- Send a link or QR codeShare it on LINE, or just read the code aloud.
- Everyone opens it in a browserOnce 1–20 players have joined, the host taps "Start".
Rule highlights
Setup, play, winning, and house rules
Setup
- 1–20 players. Alone, you can chase your best time or race the CPU.
- Choose Intro (6×6), Easy, Medium, Hard or Expert. Intro uses 1–6 on a 6×6 grid with 3×2 boxes.
- Everyone gets the same puzzle and starts together on 3-2-1 (the numbers are hidden until then).
How to play
- Tap an empty square to select it, then tap a number below. Tap the same number again to clear it.
- Turn on [Notes] to pencil in small candidate numbers. [Erase] empties the selected square and [Undo] takes back your last change.
- If the same number appears twice in a row, column or box, it is marked (! and an underline) and a short reason appears where you tapped. There is no penalty for mistakes.
- There are no turns: everyone solves their own grid at their own pace. You can't see other grids; the top three names and their progress (%) are shown at the edge of the screen, plus your own rank if you are 4th or lower.
- Progress is the share of the originally empty squares that you have filled without a clash.
Winning
- The puzzle is solved when every square is filled with no clashes. Finishers are ranked by time.
- You can keep playing after the target time. Finishers within the limit rank ahead of later finishers, ordered by completion time. Players who press [Quit] rank last. Rounds that go past the limit earn no points.
- The round ends when all human players finish or quit, even if CPUs are still solving. Humans can keep playing if a CPU finishes first. After 60 minutes from the start, results use the progress so far. Unfinished players rank by progress. [Play again] starts the next round.
- With the handicap on, the winner's next puzzle is one level harder (more if they keep winning). Ranking is still by time.
House rules
| Name | Description | Default | Changeable |
|---|---|---|---|
| Difficulty | How hard the puzzle is. Intro is 6×6; the others are 9×9. | Easy | Yes |
| Handicap the winnerHandicap the winnerWhen on, the previous round's winner solves a puzzle one level harder. Each further win adds another level; losing returns you to the chosen difficulty. Even when puzzles differ, ranking is by finishing time. | Only the winner gets a puzzle one level harder next time. | Off | Yes |
| Time limit | Your target time. Play continues after it and the clock counts overtime. At 60 minutes from the start, results use your progress. | 10 min | Yes |
| Auto-clear notesAuto-clear notesCleared notes come back together with the number when you press [Undo]. | Placing a number clears it from the notes in the same row, column and box. | On | Yes |
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FAQ
How many players?
1 to 20. Everyone gets the same puzzle and races to finish.
Can I see how far the others are?
Yes. The top three names and their progress (%) are shown live at the edge of the screen, plus your own rank if you are 4th or lower. Other players' grids stay hidden.
Can I play alone?
Yes. [Play vs CPU] races the CPU, or create a table and start it by yourself for a time attack against your personal best.
What if players have different skill levels?
Turn on Handicap the winner: the winner's next puzzle becomes one level harder.
How long does a round take?
About 1–3 minutes on Intro and 3–8 on Easy. You can also set a 3, 5 or 10 minute limit.
Can I play on a phone?
Yes. No app is needed — just open it in a browser. You can join the same party as people on a PC or tablet.
Can two people play?
Yes. This game supports 2 or more players.
Rights holder and physical edition
This is a public-domain classic game. The rules follow the standard reference rules.
Related games
Same type (Board)
Same player count
Last updated 2026-10-05 · Run by Qdan, Inc.