A puzzle for today
A daily challenge for a spare moment
Your next Sudoku. At your own pace.
Unisu is a Sudoku app for iPhone and Android. Play without ads, keep pencil marks and explore the reasoning behind a move when you get stuck.
No ads
Keep your attention on the grid
Hints and lessons
Follow the reasoning behind a move
Works offline
Puzzles and lessons are stored in the app
Room for the puzzle. And your train of thought.
Sometimes you need one clue, rather than the rest of the solution. Unisu pairs the classic grid with pencil marks, staged explanations and lessons on individual techniques.
No ad interruptions
Keep your own pencil marks
Read why a move works
Practice one technique at a time
Adjust the display and feedback
Tools for your next move
Sometimes you need one clue, rather than the rest of the solution. Unisu pairs the classic grid with pencil marks, staged explanations and lessons on individual techniques.
Numbers and pencil marks
Enter a number you can justify, or keep small notes for the possibilities. Recheck affected cells after a move.
An explanation in stages
Start with the relevant area, then read the reasoning and the specific move. You still enter the number yourself.
The daily puzzle
A new puzzle for the day. Your Streak counts consecutive days on which you finish a puzzle.
One technique at a time
Lessons run from Full House to more involved chains. Guided examples lead into tasks you can try yourself.
Your progress
Statistics record your puzzles and results, giving you a way to look back at previous games.
A setup that suits you
Adjust colors, text size, sound and haptics in settings.
A look inside Unisu
See the actual puzzle and lesson screens, then choose the store for your phone.
Lessons
Explore a technique
Choose a lesson and follow its reasoning on a real grid.
Browse the learning guidesWhere would you like to start?
Getting back into it
Use a repeatable search order to work with the clues already on the grid.
Read more: Getting back into itWorking on a pattern
Find your way through singles, pairs, wings and chains.
Read more: Working on a patternLearn the rules, return after a break or make sense of a particular pattern. Choose the guide that fits what you need now.
Browse the learning guidesAn idea for your next puzzle
Each guide explains a principle through one example. The app gives you a place to practice it step by step.
Fundamentals
How to play Sudoku: rules and your first move
One of each number in every row, column and 3×3 box: learn the rules of classic Sudoku and follow a first certain move.
Read more: How to play Sudoku: rules and your first move
Fundamentals
Sudoku pencil marks: track and update candidates
A small note records a possibility. Learn how candidates differ from placements and how to keep them up to date.
Read more: Sudoku pencil marks: track and update candidatesFundamentals
Sudoku help: find a logical next move
Stuck on a Sudoku? Follow a checklist, work through one certain move and see how Unisu’s three hint stages explain the next logical step.
Read more: Sudoku help: find a logical next moveNo articles found. Try another search.
Frequently asked questions
What can I do in Unisu?
Solve classic 9×9 Sudoku, keep candidate notes and understand your next logical move. Explained hints and guided lessons help along the way.
Is Unisu available for iPhone and Android?
The website links to Unisu in the App Store and Google Play. Choose your phone’s store for the requirements of the version offered there.
Can I use Unisu offline?
Puzzles, lessons and saved games are local to the installed app. Downloads, updates, external links and sending a message need a connection.
Do I have to watch an ad for a hint?
The current app has no advertising. You do not need to watch a video to open a hint.
Is everything in the app free?
The current version has no in-app purchases. Check the relevant store for its price and included content.
Can I play on this website?
This website contains explanations and a look at the app. Download Unisu to your phone to play.
More about the app
Sudoku with no ads: what Unisu offers
The current Unisu app contains no ads. Here is what that means for play and the available app features.
Read more: Sudoku with no ads: what Unisu offersPlay Sudoku offline with Unisu
Puzzles, lessons and saved games are local to the installed app. Downloading the app and sending a request need a connection.
Read more: Play Sudoku offline with UnisuReady for a puzzle? Take a moment.
Download Unisu on your phone. Start a Sudoku or choose a lesson on the technique you want to understand.