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This DLC is a port from Left 4 Dead, adding the campaigns The Sacrifice and No Mercy. Initially, it was to be released for the first game alone, but since players would have to own Left 4 Dead to experience the events that explain The Passing, the developers opted to release it for both games. No Mercy was brought over as well because it was the most popular campaign. Both campaigns are available...
Left 4 Dead 2: The Sacrifice was released on October 5, 2010.
Left 4 Dead 2: The Sacrifice is available on Xbox 360, PC (Microsoft Windows).
Left 4 Dead 2: The Sacrifice is rated M by ESRB.