From Killing Floor Wiki
|| 14 Dec 2010 – 4 Jan 2011,
7 Dec 2011 – 4 Jan 2012,
11 Dec 2012 – 3 Jan 2013,
4 Dec 2013 - 2 Jan 2014
1030, 1031, 1031.2
Twisted Christmas is an annual event that has been conducted around Christmas time since 2010. Each year, it comes with content packs of variable size, Christmas-themed specimens, and new achievements.
 Christmas 2010
The first Twisted Christmas event took place between 14 December 2010 and 4 January 2011. The new additions included hell on earth difficulty, the Santa's Evil Lair map, 14 Christmas themed achievements and map completion achievements for all official maps lacking them, a Santa costume, two Team Fortress 2 Pyro costumes, and Christmas themed skins for all the specimens. Additionally the London's Finest character pack was released as DLC.
 Christmas 2011
The second Twisted Christmas event took place between 7 December 2011 and 4 January 2012. In addition to the Christmas themed objects from the previous year, there were new additions including 9 Christmas themed achievements, the winter weapons pack, and the Ice Cave map. The second steampunk character pack was also added as DLC at this time.
The weapons that came with the second Christmas event are the .44 Magnum, two variants of the M4 carbine, the claymore, the combat shotgun, the MP5M medic gun, and the Husk fireball launcher.
 Christmas 2012
The third Twisted Christmas event was slated to take place between 11 December 2012 and 3 January 2013. Due to technical hitches, the event was postponed until night time of the 12th. The event included 9 new achievements, the Schneidzekk medic gun, the Zed Eradication Device, the Dwarfs!? axe (requires you play the free version of Tripwire's Dwarfs!? game or buy the full version to unlock), and Santa's Moon Base space-themed map. Two additional DLC packs were released with the event: the Golden Weapons Pack and the Robot Special character pack, which included a new character name D.A.R. (Domestic Assistance Robot).
 Christmas 2013
Twisted Christmas 2013 is the fourth Christmas event that occurred between 4 Dec 2013 and 2 Jan 2014 . Twisted Christmas 2013 brought two new maps (Forgotten and Hell), a new skin for Harchier Spebbington, it brought the return of the Christmas zeds, and many major and minor fixes and changes.
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