Dark Carnival

Dark Carnival is the second campaign of Left 4 Dead 2, that takes place in a Whispering Oaks carnival. This campaign brings unique situations to Left 4 Dead 2. One situation described by the writer was that how weird it would be when the merry-go-round starts while you're fighting an Infected horde. It is the third campaign to be announced by Valve.

Trivia

 * This level looks very similar to the 2009 movie, Zombieland, that has four survivors fighting zombies in an amusement park.
 * As seen in a screenshot for Dark Carnival, it seems that there is a new form of Uncommon Common Infected for this campaign, that has the appearance of an Infected clown . It may also just be a Common Infected that can only be seen in the Dark Carnival campaign; just like the Infected patients that can only be seen in Mercy Hospital.
 * This level may be based in part on the light gun arcade game CarnEvil.
 * From screenshots revealed by Valve, it appears that the Dark Carnival campaign will take place at night, thus putting to rest the rumors about Swamp Fever being the only campaign to be set at night.