Counter-Strike: Global Offensive (abbreviated as CS:GO) is an online first-person shooter developed by Valve Corporation and Hidden Path Entertainment, who also maintained Counter-Strike: Source after its release. It is the fourth game in the Counter-Strike franchise, excluding Counter-Strike Neo and Online. Global Offensive was released on August 21, 2012, and made available for Microsoft Windows and OS X on Steam, Xbox Live Arcade, and a US-only version on PlayStation Network. It features classic content, such as revamped versions of classic maps; as well as brand new maps, characters and game modes. Cross-platform multiplayer was planned between Windows, OS X and PSN players, but was ultimately limited to Windows and Mac OS because of the differences in update-frequency between systems.