In a post on Valve’s official Left 4 Dead blog that previews a new piece of downloadable content for Left 4 Dead, the company suggest that the new content will be available for Left 4 Dead October 5 on the PC, Xbox 360… and Mac. If the add-on is coming to the Mac, as Valve’s post states, then the actual games required to play it must be along for the ride as well.

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