Developer Valve sent word that Crash Course, the second downloadable content pack for Left 4 Dead will hit Steam and Xbox 360 on September 29. In usual Valve fashion, it will be available free of charge to PC owners of the game, adding an all-new set of maps across the single player and multiplayer game modes. Due to Microsoft imposed policies, 360 owners will have to muster up 560 MS points ($7) for the content.

In terms of placement, the campaign itself bridges the gap story-wise between the end of No Mercy and the beginning of Death Toll, offering an explanation of how exactly the survivors ended up in an undead infested forest. Minor tweaks have worked their way into the DLC pack as well, including a recharge meter for infected as well as changes to the way items are spawned in an effort to further gameplay balance.

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Read more: Left 4 Dead Gets A Crash Course With New DLC,  Valve Confirms Left 4 Dead DLC Will Be Free On PC, Xbox 360,  Left 4 Dead 2 Game Add-On 1 Brings Back Original Cast,  Left 4 Dead Free, 40 Percent Off This Weekend Only,  The Sacrifice DLC Hits L4D, L4D2 October 5