Killing Floor is an extremely fun co-op multiplayer shooter where players team up to fight off waves of zombie hoards. The team at Tripwire Interactive has been releasing free DLC in the form of new weapons, maps, and characters for the past few summers, in addition to a separate Christmas event, and this year is no exception. The Summer Sideshow Pier of Pain event arrives tomorrow and brings a new game mode with it in addition to a new map and other new items. The new Objective Mode adds tasks for players to complete in addition to the standard zombie wave elimination. The game will be free to play for a week starting on July 4.
Source: PC Gamer