Do you want to save your Fortress to play on multiple Android devices? Great, connecting to Google Games is quick and easy!
In order to do this you must first be on an Android device and have a Google+ enabled Google account.
First, from in game tap on the Google Games button in the Menu Scroll.
Next tap on the Login button.
If you have already set up your Google+ account with your device you will be automatically logged in and your Fortress will be saved to that account.
If you receive a sign in error it means you have not correctly set up your Google+ account in your device. You can add this account via your Android settings menu in the Accounts area.
If you want to know how to log in to your Fortress on multiple devices check out this article: