Ever since Valve released its L4D development code back in May, diligent L4D fans have been messing around with the game's mechanics and coming up with original content. And while some of this DLC remains fairly uninspiring, particularly the mods, there are some standout new maps and campaigns out there. What follows are our picks of the top five downloadable maps for L4D. So reload that shotgun and turn on your flash light. There are still plenty of zombies out there to kill. -
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