Tripwire Interactive continues down its path of generosity with even more free content for Killing Floor. This time, the promotion is called the Summer Sideshow, and it lasts from June 30 to July 22.
What is it? Simple! The Abusement Park map, further achievements, and theme-appropriate characters to prolong the life of this rather fun co-op survival game. I personally got the game from the Indie Potato bundle and have been looking for an excuse to get back into Killing Floor.
On a more serious note: Clowns. Why did it have to be clowns? Even those absurdly stupid alien ones in Killer Klowns from Outer Space creep me out.