Support

Open the Pro screen and tap Restore purchases. Purchases are tied to your Apple Account, so they come back on every iPhone and iPad signed in to the same account, at no extra cost.

No. Box Brain Pro and the Skins pack are one-time purchases that you keep for good. There are no subscriptions in the app.

Pro unlocks everything: unlimited play in all twelve modes, no ads, unlimited explained hints, the full daily archive, all skins and printable puzzle books. The Skins pack ($2.99) unlocks every skin on its own, for players who only want the looks.

Yes. On the Skins screen, you can try each locked skin once, for a whole game. The trial ends when you start another game.

Apple handles payments and refunds. Request one at reportaproblem.apple.com.

No. With Settings › Sync across devices on, your progress is kept in your iCloud and comes back on any iPhone or iPad signed in to the same Apple Account, even after deleting the app. Signing in to Game Center keeps a second copy.

Use Settings › Back up progress to save a file, then Settings › Restore from a backup on the other device.

Not necessarily. You earn a streak saver every 7 days, and each one covers a missed day automatically.

Tap Hint for a nudge that names the technique and points to where it applies. Tap again to see the move and why it works. The free version includes 3 hints per puzzle; Pro has unlimited hints.

After you solve a puzzle, share it as a challenge. Your friend gets a link to the same puzzle with your time to beat. The link shows the puzzle and the time to beat. Tap Open in Box Brain Sudoku to play it in the app. If the app isn't installed yet, get it from the App Store, then come back and tap Open.

Yes. Every puzzle has exactly one solution and can be solved by logic alone. Difficulty is rated by the techniques a puzzle needs, not by how many cells are empty.

Go to Settings › Manage ad consent. This appears where the law requires a consent choice, such as in the EEA, the UK and Switzerland. Buying Pro removes all ads.

No account and no personal data. See the privacy policy for the details on ads, anonymous analytics and crash reports.

Yes. Every cell reads its clues, and you can hear a row, column or box and enter, note or erase digits without seeing the board. Settings › Accessibility has one-tap setups for blindness, low vision and colour blindness. Read aloud speaks each move without a screen reader.

Go to Settings › Braille sheets and choose a mode and difficulty. Sheets are made for braille embossers and swell paper, and are free for everyone.

iPhone, iPad and iPhone Duo. On iPhone Duo the board fits folded or open, and your game carries on as you fold or unfold. An Android version is coming later.