Melio/Sudoku
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Solo, with friends,
or against them.

A calm, focused sudoku you can share. Pick a difficulty, or invite someone in. How multiplayer works →

New to sudoku? Rules in 30 seconds →

Daily challenge
Extreme
Today's puzzle, same for everyone
Build a streak. Climb the daily leaderboard.

Solo

Easy
A relaxing warm-up.
Medium
Balanced and steady.
Hard
Real chains and pairs.
Expert
For the truly fearless.
Extreme
The hardest sudoku math allows.
About each difficulty:Easy ·Medium ·Hard ·Expert ·Extreme

Multiplayer

Race a friend
Same puzzle, separate boards, fastest wins.
Race the bot
No one online? Race a solver bot to the finish.
Co-op with a friend
Solve a single board together.
Watch live
Share a watch link, anyone can spectate without taking a slot.

Sudoku tools

🔍
Solver
Paste any 9×9 puzzle and get the solution. Browser-only, instant.
🖨
Printable puzzles
Generate a fresh sudoku, print it on paper. Solution on the next page.
🎯
Scanning practice
Endless mini-rounds drilling naked singles. Streak + accuracy tracking.
🎨
Themes gallery
14 board themes with animated decorations. Pick one in a click.
📖
Glossary
Every sudoku term defined: naked pair, X-wing, peer, fish.
🪜
Techniques ladder
Every solving technique by skill tier. Pick what to learn next.
Save progress. Track stats. Challenge friends.
A free account, no fuss.
Create an account

Strategy

Beginner
Sudoku tips for beginners
Cross-hatching, naked singles, pencil marks. Your first 10 puzzles.
Intermediate
How to solve hard sudoku
Pointing pairs, box-line, naked pairs, X-wing. Examples included.
Advanced
Swordfish & jellyfish patterns
When X-wing isn't enough. The 3-row and 4-row fish.
Multiplayer
Host a sudoku tournament
Run a 4-16 player bracket with race + spectator + rematch.