Linking your game to a Google Play (Android) or Game Center (iOS) account is the best way to save your game progress.
Why? Glad you asked
- You can play on multiple devices. Use your tablet at home for the larger screen, but play on your phone when you’re on-the-go.
- Lost your mobile device or bought a new one? No problem. You can bring your progress with you.
- Recover your game progress. If you lose your game progress due to a device factory reset, a major OS update, or deleting/reinstalling the app, you can still get back in the game and pick up where you left off.