Sudoku — Worlds & Daily Logic — Support

Sudoku — Worlds & Daily Logic is organized into six difficulty Worlds: Easy, Medium, Hard, Expert, Master, and Grandmaster. Each World contains 30 handcrafted puzzles for 180 in total. Every puzzle is verified to have exactly one logical solution, so you never need to guess. Earn up to 3 stars per level by solving it, beating the par time, and finishing with zero hints. Clear levels to unlock the next World as your skills sharpen.

The Daily Challenge is a single fresh puzzle that is the same for every player worldwide each day. Completing it extends your streak, and you can browse your calendar to see your history of victories. Daily wins also refill your hint pouch. If you miss a day your streak resets, but you can start a new one anytime. Your streak and calendar are stored on your device.

The hint engine teaches rather than just filling squares. It first checks for and fixes mistakes, then finds the next genuinely logical move (such as a naked single or hidden single) so you learn real solving techniques. Your hint pouch refills as you win Daily Challenges. If hints aren't appearing, make sure you have started a puzzle and have available hints, then try closing and reopening the app.

All progress, streaks, and statistics are stored locally on your device — no account is required. Progress can be lost if the app is deleted and reinstalled, or if you switch to a new device, because there is no cloud account to restore from. To keep your data, avoid deleting the app. If your data vanished without reinstalling, please email us at support@brainrash.com with your device model and iOS version and we will help investigate.

Best times sync to Game Center leaderboards per World, and achievements unlock for streaks, perfect solves, and World clears. If they aren't updating, open Settings > Game Center on your device and confirm you are signed in, then make sure Game Center is enabled. A stable internet connection is required to submit scores. Reopen the app after signing in. If problems persist, contact us at support@brainrash.com.

Yes. Sudoku — Worlds & Daily Logic is offline-first: no account, no internet connection, and no ads are required to play. The only feature that needs a connection is submitting scores to Game Center leaderboards. You can play every World and the cached Daily Challenge on a plane, on the subway, or anywhere.

Open the in-app Settings to choose from six themes — Paper, Midnight, Zen Garden, Sakura, Nebula, and High Contrast — and to toggle sounds and haptics on or off. The High Contrast theme and color-blind-safe markers are designed for better visibility.

The app includes full VoiceOver support, a color-blind-safe palette and markers, a larger-digit mode, and Dynamic Type friendly text. If you encounter an accessibility issue, please email support@brainrash.com and describe the problem so we can address it.

Sudoku — Worlds & Daily Logic supports iPhone and iPad running iOS 16.0 or later. iPhone is portrait-oriented; iPad supports both portrait and landscape.

We read every message. Email support@brainrash.com with the subject line "Sudoku" and include your device model, iOS version, and a description of the issue or idea. Screenshots help. We typically respond within 1–2 business days.