A free, offline sudoku app for iPhone, iPad, and Android: a few quiet minutes with one puzzle and nothing else competing for your attention. Classic, Killer, and Rescue sudoku, a daily challenge, and unlimited puzzles with no Wi‑Fi — no account and no clutter.
Free to play
Ad-free Premium supports updates
No account needed
Open it and start solving
Works fully offline
Puzzles made on your device
iPhone, iPad & Android
Same app on every screen
A spooky logic puzzle that lives right next to your sudoku. Hide one ghost on every floor, in every hall and in every room — and no two ghosts may touch, not even diagonally.
Every detail is designed to keep you focused on what matters — solving the puzzle.
Classic 9×9 from Easy to Expert, Killer’s sum cages, and Rescue, where you take over a badly solved puzzle and save it.
The Daily Challenge: a fresh puzzle every day, the same for every player worldwide. Build your streak one solve at a time.
Light or dark, following your phone. Ads never interrupt a puzzle, and there is no forced sign-up.
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.
Classic from Easy to Expert, Killer with its sum cages, and Rescue, where you save a puzzle someone else got wrong.
Every puzzle auto-saves, so a game survives the phone going in your pocket.
One shared puzzle a day, with a streak that only grows if you keep showing up.
No ads mid-puzzle, no forced sign-up, no feed to scroll. Just the grid.
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 unobtrusive ads that never interrupt a puzzle. 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.
Three kinds of sudoku: Classic, Killer, where cages with sums replace the given numbers, and Rescue, where you take over a badly solved puzzle and fix it. Alongside them is Haunted Manor, a Halloween logic puzzle in which you hide one ghost on every floor, in every hall and in every room, with no two ghosts touching.
Classic has four difficulty levels — Easy, Medium, Hard, and Expert — so it works for both newcomers and experienced solvers. Killer and Rescue have their own levels, and Haunted Manor comes in three sizes: Cottage, Manor, and Castle.
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.
Yes, with Premium. To keep the app free, the free version shows a small banner at the bottom of the screen and a short full-screen ad after every third finished puzzle — never while you are playing. You can also watch an optional video for extra hints. Premium removes every ad, and it is a small way to support One Sudoku so new puzzles and updates keep coming: $0.99 a month, $9.99 a year, or $29.99 once.
Yes. One Sudoku is available on the App Store for iPhone and iPad, and on Google Play for Android phones and tablets.
Yes. One Sudoku follows your phone’s light or dark appearance, and you can pin either one in Settings.
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 for iPhone, iPad, or Android and start solving today — offline, no account required, no catch.
One Sudoku
Free · No account required