The 2011 Halloween Sideshow was an update event for Killing Floor occurring between 27 October and 3 November 2011. The event featured re-skinned specimens, with designs based off the Summer Sideshow specimens, new event achievements and allowed players complete achievements from the previous event; the Summer Sideshow. Players who completed all six Halloween achievements received the Commando Chicken character skin.
- Halloween Sideshow Event 2011
- Hillbilly Horror Event 2012
- Halloween – Fright Yard! 2013
- Halloween - Hillbilly Horror Event 2012 Trailer
- Halloween - Fright Yard! 2013 Trailer
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