|Google Play Games|
These new features will provide new goals for players and let your friends who also play the game to show off or challenge you to keep up with their stellar empire.
|Game Circle on Amazon Kindle Fire|
Completely optionally, we won't require you to sign in or use these new features -- but we think they're a lot of fun! Of course, we'll also be adding them to the iOS version by supporting Game Center (not pictured.)