Multiplayer Sudoku — co-op and competitive

Co-op Sudoku — one puzzle, two players

In co-op mode you and a friend share a single Sudoku board. See each other's cursor, dog avatar, and colored entries in real time. You share a three-strike mistake limit, so communication and careful notes pay off.

Co-op is perfect for couples, classmates, or anyone who wants to solve a hard puzzle as a team without passing a paper back and forth.

Competitive Sudoku — race for squares

Competitive mode gives both players the same starting grid. Every correct number you place counts toward your score. When the puzzle is solved, whoever filled more cells wins — ties happen, and rematches are one tap away.

Live opponent presence shows who's active on the board, making online Sudoku feel social instead of solitary.

How to start a multiplayer game

Open Sudogku, go to Play, choose Multiplayer, and create a room. Share the code via text or link. Your friend joins from any device with a browser — no download required.

Multiplayer uses real-time sync so moves appear instantly. Stats from co-op and competitive games feed into separate win/loss records on your profile.

Frequently asked questions

Is Sudogku free to play?

Yes. Sudogku is completely free — play unlimited Sudoku puzzles online in your browser with no download or subscription required.

Can I play Sudoku with a friend online?

Yes. Sudogku supports real-time multiplayer Sudoku. Share a room code to play co-op on one puzzle together or compete to fill the most squares.

What Sudoku difficulty levels are available?

Sudogku offers Easy, Medium, Hard, Expert, and Master puzzles. Each board is freshly generated with a unique solution.

Does Sudogku work on mobile?

Yes. Sudogku is built for phones and tablets. You can also add it to your home screen as a PWA for an app-like experience.

More ways to play

• Free Sudoku

  Warm up with solo puzzles first.

• Sudoku online

  Play in the browser on any device.

• Sudogku home

  Create a room from the Play tab.