If the game fails to launch or closes immediately, work through these steps in order.
Restart your device.
Update the game to the latest version.
Clear the app cache: Settings → Apps → the game → Storage → Clear cache.
Ensure you have enough free storage.
As a last resort, uninstall and reinstall (cloud saves are preserved if you're signed in).
Note: Still stuck? Open a ticket with your device model and Android version.