Write to us.
Describe what happened. The app version, iOS version and iPhone model help us investigate.
Email supportWe are here to help
Support
If a digit was not recognised correctly or you have a question, start with these quick checks or contact the developer.
For a clean scan.
Keep the full 9×9 grid visible, use even lighting and hold the iPhone parallel to the puzzle.
Quick help
Things to check.
Most scan issues are solved by a steady image and visible outer edges.
The Sudoku is not found.
Show all four outer edges, avoid reflections and keep the iPhone parallel to the puzzle.
A digit is wrong or unclear.
Use Correct Recognition and change only the affected cells.
Why does SudoFlash need the camera?
The camera captures the Sudoku. Core processing happens on your iPhone. Full camera images are never uploaded; on compatible iOS 27 devices, only isolated images of difficult printed digits may be sent to Apple Private Cloud Compute.
How do I manage a subscription?
Open Settings → Manage Subscription in SudoFlash or use Apple’s subscription settings.