Reinstalling the Game and Lost Progress
However, when you are not logged in with Facebook, your progress cannot be synced between devices or saved upon reinstallation.
We recommend that all players connect to Facebook, as playing as a Guest means that your progress may be reset when your game is impacted by an external factor, such as an update to the game, your device, or your operating system. We have provided players with Facebook connect as a way of locking in progress across different devices or updates.