Multiplayersudoku.

Race a friend on the same puzzle. Solve one together in co-op. Or stream a match like a chess broadcast. Free, real-time, runs in a browser, no app to install.

Free foreverNo app neededUp to 8 playersLive cursors

Start a multiplayer game Or try solo first

Race mode — live

03:42 elapsed

you72%

1 ✕

alex58%

0 ✕

Both players are solving the same puzzle. The first to finish a valid grid wins outright.

Three ways to play together

Same engine, same puzzles, different social dynamics. Pick the mode that fits the room.

Race

Same puzzle, same start. First to fill it correctly wins. Live progress bars show how close everyone is.

Both players (or a whole table of them) get the same 9×9 grid at the same moment. As you fill cells, your progress percentage updates live for everyone else. Mistakes cost time. The grid auto-validates on completion, so the first valid solve wins outright — no ambiguity.

Best for
Two friends with five spare minutes; settling who's faster; warming up before a tournament.

Co-op

One puzzle, the whole group solving it together. You see each other's cursors and number entries in real time.

Everyone shares a single board. Each cell you enter is visible to the rest of the table immediately, complete with a name label on your cursor. Useful for hard puzzles when no single solver wants to grind it alone, or as a way to teach techniques to a beginner without backseating.

Best for
Beating an Extreme together; teaching a new solver; relaxed Friday-night sudoku with the family.

Spectator

A view-only mode for an audience. Match feels like a chess broadcast — both boards visible, scores live.

Stream-friendly. Both players' boards render side-by-side, with their live progress, mistake counts, and timers. Spectators can join the URL without affecting the game. We've seen people use this for charity sudoku showdowns, Discord-server tournaments, and weekly internal team competitions.

Best for
Streaming on Twitch or YouTube; hosting a tournament final; sharing a friend's solve with the group chat.

How it works

1
Pick a mode and difficulty
Race, co-op, or spectator. Easy through Extreme. Takes about three clicks on /sudoku/new-game.
2
Send the room link
We mint a unique URL on the spot. Paste it into a DM, Discord, Slack, group chat — anywhere. No invite codes to type, no friend-list system to set up first.
3
Solve together (or race)
Cursors, number entries, mistakes, and timer all sync in real time. Each player's color shows up live on the board.
4
Share the result
On finish, hit Copy link. The shared URL renders a real social card with the winner, time, and difficulty when pasted into Discord, iMessage, or X.

What’s different from solo sudoku

→Live cursors. Every player’s cell focus is visible with a colored ring + name label. You can tell at a glance who’s scanning where.
→Real-time progress. Race mode shows each player’s completion percentage as a live bar — no surprise winner.
→Disconnect-resilient. Close the tab, walk away for an hour, come back. Your position and place in the room are preserved.
→Shareable result cards. Every finish has a /sudoku/share/… URL with a rich preview, so pasting the link into Discord expands into a winner card.
→No app, no signup for invitees. Click a link, you’re in. The host needs a free account (one click with Google).

FAQ

Is multiplayer sudoku free?

Yes, every mode on Melio is free. No ads, no premium tier. The whole point is that real-time multiplayer sudoku should be a thing that exists and works in a browser.

Do you need an account to play multiplayer sudoku?

The host needs an account (free, takes about 5 seconds with Google sign-in). Invitees can join with a one-click link and play without signing up — their results just aren't saved to a profile.

Can I play multiplayer sudoku with someone in another city?

Yes — the room is a shareable URL. Send the link, the other person clicks it, and you're both in the same puzzle with live cursors and live scoring. Works across any distance, on any device with a browser.

How many people can play at once?

Up to 8 players per room across all three modes. For tournament-style brackets with more participants, see the host-a-sudoku-tournament guide.

What happens if someone disconnects mid-game?

Their progress and place in the room is preserved. They can reload the page or come back later and continue from where they left off. The other players see them as 'away' until they return.

How it works

Pick a mode and difficulty

Race, co-op, or spectator. Easy through Extreme. Takes about three clicks on /sudoku/new-game.

Send the room link

We mint a unique URL on the spot. Paste it into a DM, Discord, Slack, group chat — anywhere. No invite codes to type, no friend-list system to set up first.

Solve together (or race)

Cursors, number entries, mistakes, and timer all sync in real time. Each player's color shows up live on the board.

Share the result

On finish, hit Copy link. The shared URL renders a real social card with the winner, time, and difficulty when pasted into Discord, iMessage, or X.

What’s different from solo sudoku

→Live cursors. Every player’s cell focus is visible with a colored ring + name label. You can tell at a glance who’s scanning where.

→Real-time progress. Race mode shows each player’s completion percentage as a live bar — no surprise winner.

→Disconnect-resilient. Close the tab, walk away for an hour, come back. Your position and place in the room are preserved.

→Shareable result cards. Every finish has a /sudoku/share/… URL with a rich preview, so pasting the link into Discord expands into a winner card.

→No app, no signup for invitees. Click a link, you’re in. The host needs a free account (one click with Google).

FAQ

Is multiplayer sudoku free?

Yes, every mode on Melio is free. No ads, no premium tier. The whole point is that real-time multiplayer sudoku should be a thing that exists and works in a browser.

Do you need an account to play multiplayer sudoku?

The host needs an account (free, takes about 5 seconds with Google sign-in). Invitees can join with a one-click link and play without signing up — their results just aren't saved to a profile.

Can I play multiplayer sudoku with someone in another city?

How many people can play at once?

Up to 8 players per room across all three modes. For tournament-style brackets with more participants, see the host-a-sudoku-tournament guide.

What happens if someone disconnects mid-game?

Their progress and place in the room is preserved. They can reload the page or come back later and continue from where they left off. The other players see them as 'away' until they return.