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From 9to5Google:

We knew from leaks in the weeks leading up to I/O that Google was planning some gaming related announcements and today the company has officially announced the service in a press release ahead of its Google I/O keynote taking place now. Not only will the service allow Android developers to build in real-time multiplayer, social features, achievements, and leaderboards while storing game saves and settings in the cloud, the SDK for Google Play game services will also be available to iOS and web developers.

Google noted a few titles for Android have already been updated with the feature including World of Goo, Super Stickman Golf 2, Beach Buggy Blitz, Kingdom Rush, Eternity Warriors 2, and Osmos.

Not surprisingly, the cross-platform gaming service will also build in Google+ integration to track high scores, achievements and more:

-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.

Google’s full press release below:

Introducing Google Play game services (May 15th, 2013)

We love to talk about games at Google. Especially the old ones, like Pac-man, Pitfall and Frogger. Since those classics, games have changed a lot. They’ve moved from that clunky box in your living room to the screen that you carry with you in your pocket wherever you go. They’re mobile, they’re social, and they’re an important part of Google Play.

Today, we’re launching Google Play game services, a core part of building a gaming platform for the next generation of games. These services help you make your games more social, with achievements, leaderboards, and multiplayer, as well as more powerful, storing game saves and settings in the cloud. They are available on Android, and many on iOS or any other connected device. By building on Google’s strengths in mobile and cloud services, you can focus on what you’re good at as game developers: creating great gaming experiences for your users.

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.

Several great Android games are already using these new game services, including World of Goo, Super Stickman Golf 2, Beach Buggy Blitz, Kingdom Rush, Eternity Warriors 2, and Osmos.

Google Play game services are available today through an SDK for Android, and a native iOS SDK for IPhone and iPad games. Web and other platform developers will also find corresponding REST APIs, with libraries for JavaScript, Java, Python, Go, Dart, PHP, and more.

We’re excited to see what games will do with these new services and experiences, and this is only the beginning. Wait until you get to the boss battle… er.. Check out our developer site to get started: https://developers.google.com/games/

Greg Hartrell, Lead Product Manager