Valve today announced that Crash Course, the second downloadable content update for Left 4 Dead, will be made available worldwide on September 29 on Xbox 360 and PC.

Crash Course delivers new single-player, multiplayer and co-operative gameplay to both platforms, and bridges the gap between the end of the "No Mercy" campaign and the beginning of "Death Toll" in the original game.

While containing both Survival maps and a Co-operative Campaign, Valve have stated that the primary goal of Crash Course 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 behaviour has changed for more balanced gameplay.

For more information, check out the official site.