You can connect to Facebook (Android and iOS devices) by tapping the game’s home screen. You can also connect to Facebook and Apple ID (iOS devices only) in the game settings menu, which can be opened by tapping the cogwheel button; if you’d like to disconnect the game from Facebook or Apple ID, you can do it there.

While connected to a Facebook or Apple account, your progress will be backed up to the cloud, so you can synchronize your progress to another device or restore your game account if you need to reinstall the game.