gamefreaksnz: Valve Reveals The Sacrifice DLC For Both Left 4 Deads Valve announced that this new Left 4 Dead downloadable episode will be called “The Sacrifice” and that it will be compatible with both Left 4 Dead games.
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gamefreaksnz:

Valve Reveals The Sacrifice DLC For Both Left 4 Deads

Valve announced that this new Left 4 Dead downloadable episode will be called “The Sacrifice” and that it will be compatible with both Left 4 Dead games.

Source: gamefreaks.co.nz