Game Center is almost out in consumers' hands, but that hasn't stopped the folks at OpenFeint from pushing forward on their unofficial social network for gamers. PlayTime is a newly-announced feature of the third-party social networking software that will allow players on both iOS and Android to play in real-time with each other, and even use voice chat while doing that. OpenFeint is splitting its multiplayer services into two different paths: "Casual" games will use highscores to offer up multiplayer and even co-op challenges, while "Core" games will actually run real-time multiplayer, in conjunction with a system from a company called Exit Games.
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