🗯 You can turn off game notifications and vibration in your device settings:

1. Open Settings → Applications.

2. Find Mystery Matters in the list of installed apps and select it.

3. Untick Allow Notifications.

📳 Vibration can be disabled in game settings — just press the "Vibration" button to turn it off (vibrating phone icon).

Please note: The vibration cannot be disabled partially in the game, it is always disabled fully.