A free sudoku game for iPhone, iPad, and Android. Four difficulty levels, a daily challenge, and unlimited offline puzzles — in a clean interface that gets out of your way.
Every detail is designed to keep you focused on what matters — solving the puzzle.
A standard 9×9 grid with Easy, Medium, Hard, and Expert — whether you're starting out or chasing a personal best.
A fresh puzzle every day, the same for every player worldwide. Build your streak one solve at a time.
Thoughtful ad placement that stays out of your way — no pop-ups, no forced sign-ups.
Puzzles are generated on your device. Play anywhere — on a plane, underground, or off the grid — no connection needed.
Candidate notes, unlimited undo, and auto-save. Every tool you need, and nothing you don't.
Best times, win rate, and streaks across every difficulty. Sign in with Google, Apple, or email if you want it synced across your devices — entirely optional.
The same clean interface on iPhone, iPad, and Android.
How to play
Sudoku is a logic puzzle played on a 9×9 grid divided into nine 3×3 boxes. Some numbers are filled in to start — your job is to complete the rest using reasoning alone. No math required.
Fill every row with the numbers 1 to 9 — each used exactly once.
Fill every column with 1 to 9 — no number may repeat.
Fill every 3×3 box with 1 to 9, again with no repeats.
When the whole grid is filled with no conflicts, the puzzle is solved. Use notes to track candidates as you go.
Everything you might want to know before you download.
Yes. One Sudoku is free to download and play with minimal, non-intrusive ads. No account required.
Completely. Puzzles are generated on your device, so you can play anywhere — on a plane, on the subway, or with no signal at all. No internet connection is ever needed.
One Sudoku offers four difficulty levels — Easy, Medium, Hard, and Expert — so it works for both newcomers and experienced solvers.
Every day there is one fresh puzzle that is the same for every player worldwide. Solve it each day to build and keep your streak.
One Sudoku shows minimal banner ads to keep the app free. You can also watch optional video ads to earn extra hints. Ads are designed to stay out of your way while you solve.
Yes. One Sudoku is available on the App Store for iPhone and iPad, and on Google Play for Android phones and tablets.
No. You can play everything as a guest, and your progress is saved on your device. Signing in with Google, Apple, or an email address is optional — it syncs your progress and streaks across your devices so nothing is lost when you switch phones.
Download One Sudoku free and start solving today — no account required, no catch.