Valve have announced the official release of their latest Left 4 Dead DLC (downloadable content) update, "Crash Course" for both PC and Xbox 360. To celebrate the release of their second DLC pack, Left 4 Dead will also be available from Steam for 50% off through till October 1st.

Entitled "Crash Course," the latest DLC delivers new single-player, multiplayer and co-operative gameplay to both platforms. "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.

This release, of course, comes in the wake of Left 4 Dead 2 controversy, which has seen the game, ahead of its intended November release, Refused Classification in Australia; Valve only recently attempting to reverse the decision with an appeal.