By: Joe Topolnisky Jun 25, 2009

Kicking things off today, the fine folks over at Valve Software have released a new patch for their hit zombie-shooter, Left 4 Dead. This latest update features an official (non-beta) SDK, a new Add-Ons menu to view which mods you have installed and full Add-On Campaign matchmaking support. You can check out the full changelog right here or just relaunch your Steam client to start downloading!

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