Sometimes it seems like you can't keep a zed down. Tripwire Interactive has announced that it's working on a sequel to its 2009 shooter, Killing Floor. Killing Floor 2 includes improvements to its melee combat, expanded perks, and a new blood system.

The game is set in Europe, one month after the events from the first game. Society is rapidly crumbling, and it's up to the player (either solo or with five friends) to try and clean up the mess that Horzine Biotech created. They'll do so using traditional firepower as well as so-called "Mad Scientist" weapons. As players progress, they can unlock perks to tailor their character to their own unique playstyles.

Tripwire seems especially proud of its new persistent blood system. As players slaughter the failed clones, they'll paint the walls with guts, gore, and severed body parts. Enemies can do the same, so it pays to stick close to your group, if you have one.

The studio has released a flood of new screens for the PC and SteamOS game, as well as a teaser trailer, which you can see below.