It looks like Steam users who paid for their copy of Modern Warfare 2 via the download service can finally play the game itself. A few hours earlier than planned, the multiplayer shooter from developer Infinity Ward and publisher Activision is now live and unlocked for those users.Modern Warfare 2 via Steam is split in two parts; the regular single player campaign is in one section while the game's multiplayer modes are listed as a separate game title. As we have reported on before, the folks who bought the game in retail stores got to play the PC version on Tuesday, even though it also uses Steam for authentication, updates and the Steameworks suite of tools for leaderboards, achievements and more.

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