Tripwire Interactive has been releasing a Christmas update for the game Killing Floor for the past few years and this year is no exception. Gamers will find themselves on the Moonbase map, complete with low gravity. A pair of new weapons, the Schneidzekk Medic Gun and Dwarfs!? Axe, have also been added with the Axe able to be unlocked by playing the free to play game. A number of new achievements have also been added and all maps and achievements from previous Christmas events will also be available.