With game services, you can incorporate:
● Achievements that increase engagement and promote different styles of play.
● Social and public leaderboards that seamlessly use Google+ circles to track high scores across friends and across the world.
● Cloud saves that provide a simple and streamlined storage API to store game saves and settings. Now players never have to replay Level 1 again.
● Real-time multiplayer for easy addition of cooperative or competitive game play on Android devices. Using G+ Circles a game can have up to 4 simultaneous friends or auto-matched players in a game session together with support for additional players coming soon.
Developers can get started with the new games services at the link below...