To restore your game progress, please follow these steps:
1. Uninstall the app.
2. Download it again from the App Store/Play Store/Amazon Store.
3. Launch the app.
4. Wait 5-10 seconds. The app will now start syncing from the server and your progress will be restored. Please be patient because this might take a little while!
5. Make sure that you are connected to the internet every time you play the game so that it can save your progress properly.
Please note that this will only apply if you have connected your app to Facebook before you lost your progress.