Amidst the flurry of announcements from Google I/O yesterday, the search giant also quietly confirmed that its Google+ Games feature will be shutting down on June 30.

"If you would like to continue playing a particular game, contact the game's developer to find out if there's a new destination site for the game," Google said in a note on its support page.

Games currently featured on Google+ Games include A Google A Day, Angry Birds, CityVille, Mafia Wars 2, and Triple Town, among others. Most, if not all, are available on other platforms.

For those who have made payments inside a Google+ game, recovering your funds depends on the developer. "Some games will be migrating data to an alternative destination site where you can continue to use your unused payments," Google said. "Other games are offering a grace period in which you can use any available credits before the game is shutdown. Contact the game developer for further information."

A full list of developers and their contact info is listed on Google's support site.

Google+ Games emerged in Aug. 2011 with popular titles like Angry Birds and Zynga Poker. But in recent years, the popularity of social network-based gaming has dwindled as more and more people switch to mobile apps on their smartphones and tablets. Last year, for example, Wooga and Electronic Arts-owned PopCap pulled their titles from Google+, while Zynga, which has relied heavily on Facebook, has taken a huge hit as gamers flee the site.

The shift to mobile gaming was evident at this week's Google I/O developer conference, where the search giant unveiled Google Play Game Services. This new set of APIs for developers adds support for things like leaderboards, achievements, cloud saving, and multiplayer invitations. You'll be able to crossplay a title, starting on an Android phone, for instance, and picking up on a tablet.

For more from I/O, check out our live blog of yesterday's opening keynote for details.

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