Grab a cup of eggnog, a candy cane, some other Christmas clich s, and celebrate the holiday with developer Tripwire Interactive's fourth annual Killing Floor Twisted Christmas event. This year, it brings us two new maps, "Hell" and "Forgotten," both from the mind of community mapper swift_brutal_death. That just screams holiday cheer to me, or maybe what we're all wishing for anyway as we untangle the Christmas lights.

The limited-time event also brings back all the previous Twisted Christmas maps and enemies, and another opportunity to unlock the special Baddest Santa character and ZED gun.

If you want to get in on the fun, now would be a good time, as Killing Floor is 50 percent off on Steam ($9.99) until Jan. 2.

Tripwire Interactive also used the opportunity to announce new content for its other big game, The Ball. The new content pack is free, and includes a two-hour campaign. All players who own The Ball will now also be able to use its protagonist, Harchier Spebbington, in Killing Floor. The Ball is also 50 percent off ($4.99) until Jan. 2.