Hi there! I understand you're having trouble with the "double tap to quit" feature not working in Sudoku Master！ Could you tell me a little more about what happens when you try to double tap to quit? For example, does nothing happen, or does the app behave differently than before? Also, have you noticed if this issue started after any recent updates or changes on your device? This helps me narrow down the cause.

In the meantime, here’s a straightforward approach to try fixing this on your WebKit browser with Android 10:

1. Close and Restart the App: Sometimes, the app might get a bit stuck. Close Sudoku Master completely (remove it from recent apps) and open it again.
2. Restart Your Device: This helps clear temporary glitches by refreshing system processes.
3. Clear Browser Cache: Since you’re using WebKit, clearing your browser cache can resolve odd behaviors.
- Go to Settings > Apps > WebKit (or your browser)
- Tap Storage > Clear cache
4. Check for Updates: Make sure both your browser and the Sudoku app are up-to-date. Updates often fix bugs related to input gestures like double taps.
5. Try an Alternative Exit Method: If the double tap quit was a gesture built into the app, check the app settings for an option to disable/enable it, or see if there’s a manual quit button.

Could you please try these steps and let me know what happens? If it still doesn’t work, I can guide you through more advanced troubleshooting or look for deeper issues related to interaction with your device’s OS.