Valve has announced their newest downloadable content for Left 4 Dead and Left 4 Dead 2. The expansion reveals new 'sacrificial gameplay' for both Xbox and PC.

Valve has announced new additions for the co-op and competitive survival-horror Left 4 Dead series (yes, both of them!). The Sacrifice, currently in development for both L4D and L4D2, can be expected for release on October 5, 2010.

Valve issued the following statement...
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