Free Call of Duty: Modern Warfare 2 Multiplayer Weekend Kicks Off on PC, Game Now 15% Off

As promised, developer Infinity Ward and digital distributor Valve have kicked off a free multiplayer weekend for Call of Duty: Modern Warfare 2 PC, enabling "gamers around the world" to download and play the shooter's multiplayer component via Steam.

Alongside the promotion, Steam--the installation of which is required to play Call of Duty: Modern Warfare 2 PC regardless of where one buys it due to its use of Steamworks--is temporarily offering 15% off the game's $59.99 asking price, making it $50.99.

Going by Steam, those that haven't purchased the game on PC have "until Sunday" to play it online, with the 15% discount valid until Monday, April 12 at 10 AM PDT. Meanwhile, the game's first add-on hits PC on May 4, bringing five more multiplayer maps. Exactly how much or even if the downloadable content will cost anything on PC has yet to be revealed, though it cost $15 on Xbox 360 and sold 2.5 million copies in the first week.