Valve  announced that Crash Course -- the second downloadable content (DLC) update for its zombie thriller, Left 4 Dead (L4D) -- is available now for Xbox 360 and PC. To celebrate, Left 4 Dead (PC) is available via Steam for 50% off its regular its regular price thru Oct 1.

            Entitled "Crash Course," the latest DLC delivers new single-player, multiplayer and co-operative gameplay to both platforms. Targeted for release in September, "Crash Course" bridges the gap between the end of the "No Mercy" campaign and the beginning of "Death Toll" in the original game, expanding the game universe with new locations, new dialogue from the original cast, and an explosive finale

While containing both Survival maps and a Co-operative Campaign, the primary goal of "Crash" is to deliver a complete Versus mode experience in just 30 minutes, resulting in a streamlined version of the game’s existing Versus campaigns. A recharge timer for infected teammates has also been added, and item spawn behavior has changed for more balanced gameplay.