When you start a new game in Civilization War, a guest account is created automatically.

To secure your game progress, be able to access your account from another device and switch between game accounts on one device, we highly recommend synchronizing it with one of the networks available.

To link your game account simply follow the below procedure:

Press Lord avatar in the top left corner of the Castle screen → Settings → Sync Account → press Sync Account button in the bottom left corner → choose your preferred way of synchronization

In case the synchronization was successful, you will see a "Sync Complete" message under the relevant network at the top of the screen.

For extra safety it is possible to sync your game account with more than one of the networks (Google, Facebook, Game Center)

! However, you cannot synchronize more than one game account to the same network.