Google Play Games Services overview

Google Play Integration

Google Play Games service getting improvements, including quest notifications and snapshots

Google Play game services announced for Android, iOS, web - Google Play Game Services - Giant Bomb

Google Play game services announced - GameSpot

Android Developers Blog: New Demographic Stats in Google Play Games Services

Google Play Games Services Dropping Support for iOS; Removes Gifts, Requests and More on Android

android - Firebase + Google Games Services - Stack Overflow

GitHub - freshplanet/ANE-Google-Play-Game-Services: Enable user to log in with Google+ to upload high score and achievements

Get Started With Google Play Games Services