Valve has announced new DLC coming to Left 4 Dead this September. The DLC is titled, Crash Course and has new single-player, multiplayer and co-op.

“Since the release of ‘Left 4 Dead’ last November, the design team has been excited about creating new experiences for this world and allowing players to do the same, by releasing much of our internal toolset, like the Survival Pack and Authoring Tools,” said Gabe Newell. “We’re working with the fans toward the ongoing entertainment value of the product.”

“Crash course” will deliver the complete Versus mode in just 30 minutes. It also has new locations and new dialogue.

Left 4 Dead: Crash Course will be released in September free of charge to PC users and 560 Gamer Points on Xbox Live.