Killing Floor is co-op survival horror game. Up to 6 players in online co-op mode, or just you, on your own, playing the Solo mode. The aim – cleanse each area of zombies, in waves, until you get to the last one. The Big One. The Patriarch. Then exterminate him, too. Actually, they aren’t “zombies”. They are the left-over “specimens” from a cheap and dirty government program to clone soldier-monsters. The basic ones will just munch on your arm and try to disembowel you. The bigger ones were the first ones they tried arming. Nothing much. Just a chainsaw or a blade for starters. They had just got on to the chain gun and rockets when the government tried to secretly shut down their secret program.

But, in the typical way these things go, the program didn’t want to be shut down. The specimens got loose. No-one was left alive to turn off the specimen-cloning equipment. And now they are running amok. Well, some of them are running amok. Others are shambling amok or even jumping amok, but you get the idea.

The police were sent in, but that wasn’t even a challenge for the specimens. The first army units hadn’t been warned what to expect. The screams of “its got a bloody chainsaw!” over the radios probably didn’t do much for morale, as whole units were chewed up. Quite literally, in some cases, of course.

The “Level Up” content pack contains 3 new maps, a new Perk, increased Perk levels, a new specimen and 7 new weapons of free new content for the game:

• KF-Wyre: a map set in the dark forests in southern England, with a hidden Horzine facility buried underground.
• KF-Bedlam: this map is set in the aftermath of a Halloween rave at a crumbling and abandoned lunatic asylum, forcing your squad to fight through claustrophobic corridors and haunted hallways, all to the left-over rave tunes and lighting.
• KF-Waterworks: the winning map from Wave 1 of the Grindhouse mapping contest, Waterworks’ stunning visuals and gameplay blew the judges away. Now you have to blow away all the specimens from the ruins of the pumping station.
• New Demolitions Perk: this one is for all those who like to blow stuff up. This is the guy who knows his explosives. Proximity-fuzed pipe-bombs and grenade launchers – you get the idea!
• All Perks now have a Level 6 to achieve – with even more goodies for getting there.
• Introducing our new Specimen – the Husk: this was Horzine’s first serious attempt at a clone with a ranged attack. Grafting a fireball-launcher to his arm gave him a vicious long-range attack and gives the gameplay a whole new dynamic. Just don’t stand still when he arrives – and have a Sharpshooter handy to keep him at bay.
• MP7M Medic Gun: Horzine took a submachine gun and added their prototype healing-dart gun to it. Now the Medic has the perfect combo of fire-power combined with the ability to heal team-mates from a distance.
• The M79 Grenade Launcher has been tucked away in Army arsenals for decades. It may be old, but it is ever-reliable and still packs quite a punch.
• The M32 Multiple Grenade Launcher takes the basic grenade launcher and allows you to fire multiple rounds in quick succession, for even more “boom”.
• AA-12 Auto Shotgun: a prototype every Support Specialist wants to get his hands on. Devastating firepower, but just eats ammo!
• M14 Enhanced Battle Rifle: the EBR is a Special Forces version of an old favorite, just right for all the Sharpshooters amongst us.
• SCAR Mk17: another Special Forces weapon, featuring a good rate of fire, good accuracy and a good heavy round. Just what every serious Commando wants!
• Proximity-fused Pipe-bomb: an all-time favorite of Demolitions guys the world over. Arm it, drop it and wait for a horde of bad guys to run over it. Just don’t be there when they do!
• Game Lobby Movie Trailers – short movie trailers will now play during the game lobby before a match. These ads will help keep the free content packs rolling!

On top of this, Tripwire is releasing the “Nightfall” DLC Character Pack at the same time, adding 4 new characters to the game.

All of this content is available as part of the full game Free Weekend on Steam now. If you already have the game, you can jump in and play right now. If you don’t, head here to download the game and play completely free for the weekend!

Key features:

• Co-op game mode for up to six players obliterating multiple waves of specimens
• Solo game mode for offline play
• Watch those crucial and violent creature deaths in slomo “ZEDtime”, even in multiplayer
• 9 different monster types trying to eat your face off, armed with everything from teeth and claws, through to chainsaws, chainguns and rocket-launchers
• 12+ weapons for the players to chose from, ranging from knives and fire-axes up to pump shotguns, rifles and a flamethrower
• Add in a welder, medical tools and body armor to help the players survive
• Persistent Perks system, allowing players to convert their in-game achievements into permanent improvements to their character’s skills and abilities
• Players choose which Perks to play with, so they can best balance out a co-op team to survive the horrors
• Open, non-linear play areas: choose when and where to fight – or run; weld doors closed to try and direct the monster horde
• Full support for Steamworks features, including Steam Achievements and Friends
• Fully-configurable, allowing players to change things as simple as the difficulty level or number of creature waves, or go so far as to set up their own favorite waves of monsters
• Includes SDK for the creation of new levels and mods

Killing Floor is currently available for digital download through Steam for $19.99.