# Sudoku – No Ads, Unlimited

> A free sudoku app with no ads, no account and no internet needed. Five difficulty levels, smart notes, unlimited undo and iCloud sync across iPhone and iPad.

- Page: https://edvinlinden.se/sudoku/
- App Store: https://apps.apple.com/app/id6757938217
- Price: free, with no in-app purchases and no subscription
- Platforms: iPhone on iOS 18.6 or later, iPad on iPadOS 18.6 or later. No Android and no web version.
- Rating: 4.4 out of 5 from 104 ratings on the US App Store, checked 2026-09-04
- Developer: Edvin Lindén, https://edvinlinden.se/about/
- Privacy policy: https://edvinlinden.se/sudoku/privacy/

## What it costs and what it leaves out

- **Free.** No purchase, no subscription, nothing locked away.
- **No ads.** No banners, no pop-ups, no videos to sit through.
- **No account.** Nothing to sign up for and no email to hand over.
- **No nagging.** No push notifications, no experience points, no streak to keep alive.

## Features

- **Natural controls.** The number pad sits under the board within reach of a thumb, and every tap answers with haptic feedback.
- **Error highlighting.** Turn it on and a wrong number is flagged as it goes in. Leave it off and nothing interrupts.
- **Dark mode.** The board follows the system appearance and turns dark with the rest of the device.
- **Statistics.** Times and streaks per difficulty, so improvement is visible.
- **Five difficulties.** Easy to Extremely Hard, graded by the solving techniques each puzzle actually needs.
- **Smart notes.** Pencil marks update themselves as the board fills in.
- **Unlimited undo.** Step back as far as you want, one move at a time.
- **iCloud sync.** Start a puzzle on a phone and finish it on an iPad.
- **Plays offline.** Every puzzle is generated and solved on the device. No connection, no interruptions.

## Languages

The app follows the language set on the device: English, German, Spanish, French, Japanese, Swedish.

## Reviews

> No ads, no gimmicks, no constant calls to upgrade. And it's available offline. What's not to like?

— Lady the Rook, 5 stars, "Just Sudoku"

> There is no lie in the title. Just Sudoku. No ads, no limits, no in app purchases. Perfect sudoku app.

— A11Ethan, 5 stars, "Simple, Effective"

> Love how simple and straight forward the app is and I'm so glad I found it after searching and searching for a great app that didn't want so much information from me. Thank you for that!

— Yellowbird4, 5 stars, "Love"

## Questions and answers

### Is Sudoku really free?

Yes. It costs nothing to download, there are no in-app purchases, no subscription and no paid tier. Every difficulty and every feature is there from the first launch.

### Are there any ads?

No. There are no banners, no full-screen ads between puzzles and no videos to watch before you can carry on. The app has no advertising in it at all.

### Does it work offline?

Yes. Puzzles are generated and solved on the device, so the app works on a plane, on the underground and in aeroplane mode.

### Do I need an account to play?

No. There is no sign-up, no login and no email address to give. Open the app and start a puzzle.

### How many difficulty levels are there?

Five, from Easy to Extremely Hard. Each puzzle is graded by the solving techniques it actually requires, so Easy stays easy and Extremely Hard earns the name.

### Does it have pencil marks?

Yes. Notes update themselves as numbers go into the board, so a possibility that is no longer valid disappears on its own.

### Is there a dark mode?

Yes. The board and the number pad follow the appearance set on the device, so Sudoku turns dark when the rest of the system does.

### Which languages does it speak?

English, German, Spanish, French, Japanese and Swedish. The app follows the language set on the device.

### Which devices does it run on?

iPhone on iOS 18.6 or later and iPad on iPadOS 18.6 or later. A puzzle started on one carries over to the other through iCloud.

### Is there an Android version?

No. Sudoku is written for Apple platforms only and there is no Android or web version.

### What data does the app collect?

Anonymous usage data, so I can see which parts of the app people use. It is not tied to an identity, it cannot be matched against any other app, and it can be switched off in the app's Privacy screen.