Game Center is an online multiplayer social gaming network released by Apple Inc. It allows users to invite friends to play a game, start a multiplayer game through matchmaking, track their achievements, and compare their high scores on a leader board. Game Center was originally announced on April 8, 2010, and became publicly available with the release of iOS 4.1 on September 8, and in November, became available in iOS 4.2 for iPad. The service underwent a major update in October 2011, for iOS 5, including support for turn-based matches. On February 16, 2012, it was announced by Apple that Game Center would be integrated into the latest version of OS X, Mountain Lion, set for a July 25, 2012 release. Some games can now share multiplayer functionality between the Mac and iOS versions of the app. Game Center can be implemented by developers in iOS 4.1 or later through the GameKit framework, located in the Cocoa Touch framework set.