Game progress can be saved by connecting it to Facebook (Android and iOS devices) and Apple ID (iOS devices only). To connect your game account, tap on the arrow on the bottom left side of the game screen, then tap on the cogwheel icon to open the game settings menu. Once that is done, simply tap the ‘Login’ button and select the option you prefer the most.
Connecting your game to other save tools on other platforms does not save your game progress!
IMPORTANT: Please remember that the game account can be connected only to a single means of backing up game progress.