[Update - 2:00pm CST] Valve has now confirmed that "The Passing" will hit both Xbox 360 and PC on Thursday, April 22. As expected, the Xbox 360 download will be priced at 560 Microsoft Points / $7, while those playing on PC will get it for free.

The company also provided details on "Mutations," described as "a series of weekly game mode events" that " range from 'Realism Versus' mode to 'Chainsaw Massacre,' which gives all players chainsaws with an unlimited supply of gasoline."

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[Original - 1:00pm CST] Following up on the flood of details, Left 4 Dead 2's "The Passi...

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