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 free Incendiary Content Pack gives a big boost to the Firebug perk in the form of a brand new weapon – the MAC-10. This submachine gun not only packs a punch with a high rate of fire and .45 caliber rounds, but for the Firebug will also fire incendiary ammo that will make his enemies do the fire dance. With this the Firebug now has his own personal close-range weapon. Also included in the content pack are four new maps that were selected from the best maps entered in the Grindhouse map making competition. These maps have been given the “Tripwire Treatment” and have been polished up and made official. And to celebrate the release Tripwire will be offering a 50% discount on Killing Floor and the existing DLC character packs through Sunday 10th October 2010.

Highlights of the content pack include:

• Four new maps – Hospital Horrors, Biohazard, Mountain Pass, and Suburbia
• New Firebug weapon – the MAC-10 firing incendiary rounds
• New money system – money now rewarded based on % of damage dealt rather than who gets the final shot, no more kill poaching for money!
• Balance changes for several perks including the Sharpshooter, Commando, and Demolition perks
• Bug and map exploit fixes

As always the content pack is free to all those who already own Killing Floor and will automatically download through Steam.

The “PostMortem” DLC Character Pack will bring you four new playable characters for the game. The DLC will be available to purchase over Steam or in-game, to anyone who already owns a copy of Killing Floor. And the characters are another assortment of the lucky survivors of the Horzine outbreak:

• Harold Hunt: Harold was the front man for the underground punk band "The Fecking Nancies", who played mingin' pubs and bars all over South London. And if he wasn't screaming into a microphone about anarchy and chaos he was out causing it by kicking the shite out of cockneys, chavs and pikies before stealing their bling. Courtesy of the Horzine outbreak, he's finding out what real anarchy and chaos is.
• Kerry Fitzpatrick: After disfiguring one inmate in his last prison fight, the others stopped calling "Kerry" a girl's name. During his transfer to the high-security psych ward at Broadmoor, he watched the guards get eaten by a herd of crazed, emaciated mutants. Kerry took pleasure ripping apart the monsters before looting the dead prison guards. From life in prison to a free man in seconds, Kerry has found a world where he truly fits in.
• Trooper Clive Jenkins: When he wasn't jumping out of airplanes and breaking heads for the British government, Jenks could usually be found getting rat-arsed in the pubs of Aldershot and picking fights with civvies. C Company was on standby when word of the outbreak struck. They loaded into the Herc and jumped over London. Straight into a mob of chainsaw-wielding nutters. Come and get some, ya ponces!
• Paramedic Alfred Anderson: Working nightshift for the hospital can be interesting. It's also a good place to stock up on supplies when the whole city has turned into a cannibalistic feeding frenzy. Well equipped and knowledgeable, Alfred's a good ally to have when a fleshless creature is beating down your door.

And the Special One-off Character: to celebrate the upcoming release of “The Ball”, we are releasing a new playable character for Killing Floor – the hero from The Ball – Harchier Spebbington himself. The character will be available exclusively to anyone who pre-purchases The Ball from Steam before the release

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.