In addition to the free update, you can add more to the mayhem by purchasing the new "London's Finest" character Pack DLC at a nominal price.
Check out the free Twisted Christmas Update you can enjoy now until Jan. 4th 2011:
- All new level: Santa’s Evil Lair
- Added a new difficulty called "Hell on Earth", which is more difficult than Suicidal was
- All creatures in game replaced with Christmas themed monsters including the Gingerfast and the Nutpound
- More than double the achievement count with over 130 total achievements
- 13 new Christmas achievements
- Unlockable "Baddest Santa" playable character
- New DLC Character Pack dubbed "London’s Finest"
- Red or blue Pyro from Team Fortress 2 playable character available to anyone that owns both Team Fortress 2 and Killing Floor
