Generating puzzle…
Generating puzzle…
Free online Sudoku
Play Sudoku online for free at Sudoku Rivals: choose Easy, Medium or Hard, solve the daily challenge, and compete against other players. No downloads, no sign-up required.
Play free online Sudoku
At Sudoku Rivals you can play Sudoku online for free, right in your browser, with nothing to download. Choose between Easy, Medium and Hard, use notes to pencil in candidates in any cell, and play with the keyboard on desktop or touch controls on mobile.
No account is required to play — you can start a game right now and decide later whether you want to save your progress and account level.
Choose your Sudoku level
Every level uses the same 9×9 grid, but requires different solving techniques:
- Easy Sudoku — great for getting started, solves almost entirely with Naked Singles.
- Medium Sudoku — introduces Locked Candidates and pairs once the obvious moves run out.
- Hard Sudoku — requires combining several logical techniques to keep progressing.
Compete in Sudoku Rivals
Beyond solo play, Sudoku Rivals has a real competitive mode: in Multiplayer Sudoku you and your opponent solve exactly the same puzzle, each on your own board, and whoever finishes first wins. Ranked matches you against opponents of similar skill and updates your competitive rating after every game.
Daily Sudoku challenge
The Daily Challenge is one Sudoku puzzle, the same for every player each day. Compete for the best time, check the daily leaderboard, and keep your streak going.
How to play Sudoku
The goal is to fill the 9×9 grid so that every row, column and 3×3 box contains the digits 1 through 9 with no repeats. New to Sudoku, or want a refresher on solving techniques? See the full guide at How to Play Sudoku.
Frequently asked questions
Can I play Sudoku for free?
Yes. Sudoku Rivals is free — you can play right in your browser, nothing to download and no account required.
How do you play Sudoku?
Fill the 9×9 grid so every row, column and 3×3 box contains the digits 1–9 with no repeats. See the full guide on How to Play Sudoku.
What's the difference between Easy, Medium and Hard?
All three levels use the same 9×9 grid; what changes is how many solving techniques are needed. Easy solves almost entirely with Naked Singles, Medium adds Locked Candidates and pairs, and Hard requires combining several techniques.
Can I play Sudoku against another person?
Yes, in Multiplayer mode: you and your opponent solve the exact same puzzle on separate boards, and whoever finishes first wins. Play Ranked against a matched opponent, or challenge a friend directly.
Is there a new Sudoku every day?
Yes. The Daily Challenge is one Sudoku puzzle, the same for every player each day, with its own leaderboard and streak.