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Overview

Killing Floor is a cooperative survival horror first-person shooter developed and published by Tripwire for the PC (via Steam) on May 14, 2009. In each round, up to six players fight against waves of "Specimens", failed genetic super-soldiers (from the London-based Horzine Biotech company) with zombie-like properties. Along the way, they purchase deadlier weaponry from a roaming Trader and gain experience for each of their character classes (known as Perks, which are carried throughout all rounds and give the player unique benefits).

The game is based on a 2005 mod of the same name for Unreal Tournament 2004. With assistance from the game's original mod team, most of the game's concept and assets were translated over to the final retail version without many changes. Throughout the years, the game received free content packs (including annual special events) and paid DLC, including cross-promotions with other games (such as Team Fortress 2, Portal 2, and Red Orchestra 2: Heroes of Stalingrad).

The game was later released for the Mac (on May 5, 2010) and most Linux platforms (on November 10, 2012).

Gameplay

In Killing Floor, players team up with up to 5 other players to survive against waves of Specimens, or Zeds as they are more commonly known. Players must kill all Zeds in a wave, and after that, get a period of time to rest and rearm. They will fight through a set number of waves, culminating in a boss wave where players pit their wits against the game's boss, the Patriarch. Most of the maps are set in Great Britain, and the cast of characters all hail from the Isles, featuring many stereotypical accents and slang.

There are 5 levels of difficulty in Killing Floor: Beginner, Normal, Hard, Suicidal, and Hell on Earth. Each level, and the number players in the team, increases Zed hitpoints, damage, and number spawned per wave. There are also 3 game lengths, Short with 4 waves, Medium with 7 waves, and Long with 10 waves. Most servers run Long games.

After every wave, players get a chance to buy new weapons and equipment at the Trader. The Trader is spread out in specific spots in a map, and is open only during the rest period. Players must make their way to her within the rest time allocated, or they will have to fight the next wave with their current equipment and ammunition. She accepts British Pounds (£) as currency, which are rewarded to a player for killing Zeds and surviving a wave. Players can also trade cash with each other, which allows newcomers to get equipped with the necessary equipment to survive the next wave.

Players can heal themselves, and each other, with their equipped Medical Syringes. These syringes are available for every player, but is limited to the amount of charge they have. Each heal takes up 50 charge, but self-heals take up 100 charge, emptying the syringe. The charges will replenish over time, and the recharge rate is increased with the Field Medic perk.

Players can dictate the movement of Zeds by shutting off passageways and doors. They can also weld doors to slow down Zed movement, as they will now have to break down those doors before passing through. Welders are available to all players, and Support Specialists gain welding bonuses in their perk.

A special feature called "Zed Time" is triggered when players perform gory kills, such as headshots. Zed Time slows down time for all players, even in multiplayer, for a period of time. The Commando and Berserker perks can increase this bonus time by killing additional Zeds while in Zed Time.

Perks

Perks are upgradable player classes that each player chooses when they enter the game, granting them special bonuses tied to a particular playstyle (for example, Firebugs excel at fire-based weaponry while Field Medics excel at healing). In-between waves, players have the option to switch to another class (but only once per wave). By performing specific tasks (no matter what Perk they choose), players can gain experience and level up their Perks (to a maximum of six levels), providing additional bonuses.

Field Medic

The Field Medic specializes in healing injured players. Field Medics get buffs with the Syringe, Combat Armour, and Medic Guns. They also have higher movement speed, have resistance to Bloat bile, and have the ability to heal teammates with their grenade explosions. They gain Perk experience by the amount of healing done to their teammates.

• Increased recharge rate of the Syringe.
• Increased health restored from each Syringe injection.
• Increased resistance to damage from the Bloat bile.
• Increased movement speed. (only in ranks 2 and up)
• Increased magazine capacity of all Medic Guns.
• Increased damage resistance while wearing the Combat Armour. (only in ranks 1 and up)
• Increased discount towards the Combat Armour and all Medic Guns.
• Grenade explosions deal less damage, but provide a temporary green smoke cloud that heals all allies inside and keeps enemies away.
• Spawns with Combat Armour. (only in ranks 5 and 6)
• Spawns with the MP7M. (only in rank 6)

Support Specialist

The Support Specialist specializes in defensive tactics, gaining buffs with the welder, grenades, and shotguns. They are also less burdened with the weight of their inventories. They gain Perk experience by both the amount of damage dealt with shotguns and the amount of welding done. (Both are unique requirements and must be gained separately to level up)

• Increased bullet damage of all shotguns.
• Increased bullet penetration of all shotguns.
• Increased ammunition capacity of all shotguns. (only in ranks 1 and up)
• Increased damage of grenade explosions. (only in ranks 1 and up)
• Increased grenade capacity. (only in ranks 1 and up)
• Increased weapon weight capacity. (only in ranks 1 and up)
• Increased welding speed.
• Increased discount towards all Shotguns.
• Spawns with the Shotgun. (only in rank 5)
• Spawns with the Hunting Shotgun. (only in rank 6)

Sharpshooter

The Sharpshooter specializes in both long-ranged weaponry and dealing heavy damage from accurate headshots, gaining buffs with all pistols and marksman weapons (such as standard rifles and crossbows). They can also deal better headshot damage from any other weapon. They gain Perk experience by the amount of decapitation kills from headshots.

• Increased damage from headshots of all weapons (with an additional damage increase if fired from a pistol or marksman weapon).
• Decreased recoil of all pistols and marksman weapons. (only in ranks 1 and up)
• Increased reloading speed of all pistols and marksman weapons. (only in ranks 1 and up)
• Increased discount towards all pistols (with the exception of the 9mm Pistol) and marksman weapons (with the exception of the Lever-Action Rifle and Compound Crossbow).
• Spawns with the Lever-Action Rifle. (only in rank 5)
• Spawns with the Compound Crossbow. (only in rank 6)

Commando

The Commando specializes in reconaissance, as Commandos have the unique ability to specify the exact amount of health of each nearby enemy. They also gain buffs for both assault rifles and battle rifles, can detect cloaked enemies within a certain distance, (This includes both Stalkers and the Patriarch) can reload weaponry faster, and can extend the slow-motion Zed-Time. They gain Perk experience by both the amount of damage dealt with assault rifles or battle rifles and the number of Stalkers killed with assault rifles or battle rifles. (Both are unique requirements and must be gained separately to level up)

• Increased bullet damage of all assault rifles and battle rifles.
• Decreased recoil of all assault rifles and battle rifles.
• Increased magazine capacity of all assault rifles and battle rifles. (only in ranks 1 and up)
• Increased discount towards all assault rifles and battle rifles.
• Increased reload speed of all weapons.
• Increased detection range of cloaked Stalkers.
• Able to see the health bar of each nearby enemy (shown directly on the enemy). Further ranks increase the range of how close the enemy needs to be for the health bar to show. (only in ranks 1 and up)
• Increased the amount of time before Zed-Time expires. (only in ranks 3 and up)
• Spawns with the Bullpup. (only in rank 5)
• Spawns with the AK-47. (only in rank 6)

Berserker

The Berserker specializes in close-ranged combat and damage resistance, gaining buffs with all melee weapons. They have damage resistance to all forms of damage (with bonus resistance to Bloat bile), can extend the slow-motion Zed-Time, and cannot be slowed down by being grabbed by a Clot. They gain Perk experience by the amount of damage dealt with melee weapons.

• Increased damage of all melee weapons.
• Increased attack speed of all melee weapons. (only in ranks 1 and up)
• Increased movement speed while a melee weapon is equipped.
• Increased resistance to all forms of damage (with bonus resistance to Bloat bile). (only in ranks 1 and up, with the exception of the bonus resistance)
• Increased discount towards the Buzzsaw Bow and all melee weapons (except the Machete and Fire Axe).
• Cannot be slowed down by being grabbed by Clots.
• Increased the amount of time before Zed-Time expires. (only in ranks 3 and up)
• Spawns with the Machete. (only in rank 5)
• Spawns with the Fire Axe. (only in rank 6)
• Spawns with Combat Armour. (only in rank 6 on the Beginner, Normal, and Hard difficulties)

Firebug

The Firebug specializes in mob control, gaining buffs with all incendiary weapons. Firebugs are also resistant to fire damage (usually dealt by themselves and Husks) and can ignite enemies by their grenade explosions. They gain Perk experience by the amount of fire damage dealt (to enemies) with incendiary weapons.

• Increased damage of all incendiary weapons.
• Increased discount towards all incendiary weapons.
• Increased reload speed of the Flamethrower and MAC-10. (only in ranks 1 and up)
• Increased magazine capacity of the Flamethrower and MAC-10. (only in ranks 1 and up)
• Increased attack range of the Flamethrower. (only in ranks 1 and up)
• Increased resistance to fire.
• Grenade explosions deal less damage, but ignites enemies in the blast radius. (only in ranks 3 and up)
• Damage dealt by the MAC-10 ignites enemies.
• Spawns with the Flamethrower. (only in ranks 5 and 6)
• Spawns with Combat Armour. (only in rank 6)

Demolition

The Demolition specializes in dealing explosive damage, gaining buffs to grenades and all explosive weaponry. Demolition experts are also resistant to explosive damage (usually dealt by themselves and the Patriarch). They gain Perk experience by the amount of explosive damage dealt to enemies.

• Increased explosive damage of grenades and all explosive weapons.
• Increased damage resistance to explosives.
• Increased grenade capacity. (only in ranks 1 and up)
• Increased capacity of Pipe Bombs.
• Increased discount towards all explosive weapons (with a bonus discount towards Pipe Bombs).
• Spawns with two Pipe Bombs. (only in ranks 5 and 6)
• Spawns with the M79. (only in rank 6)

Specimens

Specimens, or Zeds, are the main opponents in Killing Floor. They are modeled after zombies, but are artificially created by Horizine Biotech to be genetic super-soldiers. Players can shoot Zeds' heads off, disabling whatever special abilities they have and taking extra damage. There are 9 types of normal Zeds in Killing Floor, and a special boss Zed known as the Patriarch. Each Zed has Circus, Halloween, and Christmas skins, used during special events held every year.

Weapons and Equipment

All players in Killing Floor spawn with a set of equipment: a knife, a 9mm pistol, a medical syringe, a welder, and some grenades. Additional weapons must be found in the maps or bought at the Trader after a wave. Each weapon has a cost, measured in Pounds (£), and a weight, counted in blocks. Every player has a maximum of 15 blocks (up to 24 for Support Specialists), and can only carry weapons up to their inventory limit. Weapons are divided by perks, and perked characters receive discounts for their respective types of weapons. Higher level perks can spawn with additional weapons or equipment.

Most weapons have an alternate fire, which activates a secondary ability like heavy attacks or flashlights.

Common Equipment

• 9mm Pistol (£150, 4 blocks for akimbo) - Semi-automatic tactical pistol. Although its damage output is overall weak, it is cheap to refill, has decent magazine size, has little recoil, and is good with headshots against weaker enemies. Alternate Fire toggles a built-in flashlight, which has a rechargable battery (that turns off automatically after some time). A 9mm Pistol is starting equipment for all players and cannot be dropped manually or sold. Players can pick up another 9mm Pistol (either dropped by dead teammates, spawned randomly on maps, or bought from the Trader) to dual-wield (sacrificing accuracy for double magazine size). Sharpshooters have increased headshot damage, recoil, and reload speed (conversely with their rank).

• Knife - A standard combat knife. Despite its weak damage, it has a very fast attack rate and can easily decapitate weak enemies. Pressing Alternate Fire does a slower heavy slash that deals more damage. Players who equip the knife have a faster movement speed. Starting equipment for all players. Cannot be dropped or sold. Berserkers have increased damage, attack speed, and movement speed (with the Knife equipped) (conversely with their rank).

• Grenades (£40, 1 block) - Simple timed grenades that is thrown to clear groups of Zeds. Grenades are thrown with their own separate button and do not need to be equipped manually. Zeds at later difficulties will actively try to avoid thrown grenades. Each player has a limited number of grenades and must replenish them either by picking up ammo boxes (spawned randomly in maps) or by purchasing from the Trader. Cannot be dropped or sold. Grenades thrown by Firebugs (at ranks 3-6) inflict enemies on fire (dealing slightly less damage), while grenades thrown by Field Medics (after the Hillbilly Horror Halloween Event) create a temporary green smoke cloud that heal all allies in the blast radius (while keeping enemies away, dealing slightly less damage in the initial blast). Support Specialists and Demolitions have increased damage and capacity (conversely with their rank).

• Medical Syringe - A syringe tool with a small, replaceable container filled with healing fluids. Pressing Primary Fire near a teammate (that does not have full health) heals 20 of the teammate's HP (at the cost of 50 charge), while pressing Alternate Fire heals the wielder for 20 HP (at the cost of 100 charge). The charge indicator recharges over time. Starting equipment for all players. Cannot be dropped or sold. Field Medics get increased recharge speed and injection health (conversely with their rank).

• Welder - A portable welding tool used to block doors and gates against Zeds (forcing them to either beat down the door or find an alternate route). Holding down Primary Fire welds while holding down Alternate Fire un-welds. Multiple players can weld or un-weld the door simultaneously to speed up the process. Both welding and un-welding takes up the tool's battery, which recharges over time. Starting equipment for all players. Cannot be dropped or sold. Support Specialists get increased welding speed (conversely with their rank).

• Combat Armour (£300) - Passive damage absorption equipment, providing players with additional layer of HP. Armor fully absorbs the damage and effects of both Bloat bile and fire, but does not absorb any damage from Siren screams and fall damage. Spawns randomly on maps. Can be repaired between waves for less money. Cannot be dropped or sold. Starting equipment for Field Medics (ranks 5 and 6), Berserkers (rank 6 on Beginner, Normal, and Hard difficulties), and Firebugs (rank 6). Field Medics get both a discount and increased damage resistance (conversely with their rank).

• Zed Eradication Device (£2000) - Heavy electrical weapon that fires plasma bolts. Holding down alternate fire generates a stasis field (a growing ball of electricity following the surface the crosshair points at) that slows down all enemies in its area. Can only be purchased after the player is in a server running Moon Base and all 16 Z.E.D. parts have been found. (They do not, however, need to get all parts for each round). No classes have any additional benefits with this weapon.

Berserker (Melee Weapons)

All melee weapons have a movement speed boost when equipped, and have an alternate fire consisting of a large swing, which is slower but deals more damage.

• Machete (£100, 1 block) - A simple, lightweight melee weapon that deals more damage than the standard Knife (albeit slightly slower in attacking). Spawns randomly on maps.

• Fire Axe (£150, 5 blocks) - A heavy fire axe that deals more damage than the Machete, but is slower to swing. Alternate fire is a large swing that deals more damage. Spawns randomly on maps.

• Katana (£1000, 3 blocks) - A lightweight sword that combines fast attacking speed (almost as fast as the Knife) with powerful damage (roughly half-way between Machete and Fire Axe).

• Chainsaw (£1000, 8 blocks) - A loud, heavy chainsaw that provides a powerful constant attack stream (with the exception of alternate fire, which provides a more powerful swing). Eliminates the melee speed boost when equipped, though the increase in damage is kept.

• Scythe (£1250, 6 blocks) - A heavy scythe that has the most powerful melee swing in the game, but also the slowest melee swing. Can only be purchased if the player has bought the Community Weapons Pack.

• Claymore (£1500, 6 blocks) - A heavy greatsword that sacrifices attacking speed (matching with the Fire Axe) for brutal damage output and long reach.

• Dwarfs?! Axe (£1500, 6 blocks) - A heavy battle axe that functions similarly to the Claymore (with shorter reach), only that each direct hit knocks enemies afar (with exception to larger enemies which are only pushed slightly until killed). Can only be purchased if the player has either purchased Dwarfs!? or acquired an accumulative 40,000 Gold in the free-to-play version of Dwarfs!?.

• Buzzsaw Bow (£2500, 7 blocks) - A specialized crossbow that fires spinning buzzsaws, which cuts through multiple enemies and bounce off surfaces multiple times. Like the Compound Crossbow, players can recover the expensive buzzsaws by picking them up. Has a 2x headshot multiplier (3x with the Sharpshooter class). Can only be purchased if the player has bought the Community Weapons Pack.

Commando (Assault Rifles and Battle Rifles)

All Assault Rifles and Battle Rifles can be toggled between fully-automatic (default) and semi-automatic (increases stability and accuracy) by pressing the Alternate Fire button.

• Bullpup (£400, 6 blocks) - A modified L22 carbine (with a holographic sight) and the cheapest assault rifle in the game. It has the weakest damage-per-shot out of all assault rifles and battle rifles, but it has the largest magazine size (tied for the largest ammunition capacity with the M4) and the fastest reload speed.

• Tommy Gun (£900, 5 blocks) - A sub-machine gun (with iron sights) that is lighter than most assault rifles and is slightly cheaper than the AK-47, but deals less damage than the AK-47 (somewhere between the AK-47 and M4). Can only be purchased if the player has bought the Community Weapons Pack.

• AK-47 (£1000, 6 blocks) - A standard assault rifle (with iron sights) that deals almost double the damage per shot than the Bullpup (at the cost of lower magazine size).

• M4 (£1000, 6 blocks) - A standard assault rifle (with a red dot sight) that has identical stats to the AK-47, with the exception of a larger ammo capacity (tied with the Bullpup for the largest out of all Commando weapons), better accuracy, less damage per shot, and the inclusion of a scope (that, when viewed down-the-sights, provides better zoom and steadier aim at the cost of being more obtrusive).

• MKb42 (£1100, 6 blocks) - A standard assault rifle (with iron sights) that has identical stats to the AK-47, with the exception of its slightly greater cost, less recoil, and greater accuracy.

• SCAR Mk.17 (£2500, 5 blocks) - An expensive battle rifle (with a red dot sight) that deals heavier damage per shot (than its cheaper counterparts), at the cost of more expensive ammunition, lower magazine size, and higher recoil. It is also slightly lighter than most assault rifles.

• FN FAL ACOG (£2750, 6 blocks) - An expensive battle rifle (with an ACOG scope) and the most expensive out of all Commando weapons. It has the same powerful stats to the SCAR Mk.17, with the exception of higher rate-of-fire, lower recoil, slightly heavier weight, higher cost, and the inclusion of an ACOG scope (that, when viewed down-the-sights, provides better zoom and steadier aim at the cost of being more obtrusive).

Demolition (Explosive Weapons)

• Pipebomb (£1500, 1 block) - bought and carried in stacks of 2, these proximity bombs can be dropped anywhere to act as mines against Zeds. Players can carry a maximum of 2 at a time (more for Demolition perk).
• M79 (£1250, 4 blocks) - A simple grenade launcher that is used to clear groups of Zeds. Beware of the smoke it causes though.
• M32 (£2500, 7 blocks) - A multiple grenade launcher similar to the M79, but can fire 6 grenades in quick succession.
• M4 203 (£3500, 6 blocks) - An M4 with an underslung M203 grenade launcher. It comes with iron sights unlike its Commando cousin, and can only fire in automatic. Alternate fire launches the grenade, which deals the same damage as the M79.
• L.A.W. (£3000, 13 blocks) - The Light Anti-tank Weapon is a rocket launcher that deals tremendous damage per shot. It comes with limited ammunition and is very heavy, so it should only be used against larger Zeds.

Field Medic (Medic Guns)

• MP7M (£3000, 3 blocks) - A personal defense weapon with an attached med-dart launcher. It has a high rate of fire and alternate fire shoots a med-dart that can heal players at range. The med-dart operates similar to the Syringe, but with a separate charge pool.
• MP5M (£5000, 3 blocks) - A sub-machinegun that deals more damage than the MP7M, but with a lower rate of fire. Alternate fire shoots the med-dart that can heal players.
• M7A3 (£7500, 6 blocks) - A fictional assault rifle that is accurate at range, and has a holographic scope. Alternate fire shoots the med-dart that can heal players.
• Schneidzekk Medic Gun

Firebug (Incendiary Weapons)

• MAC-10 (£500, 4 blocks) - A sub-machinegun with a high rate of fire. It can fire incendiary bullets in the hand of a Firebug, but not with the other perks. Alternate fire toggles between automatic and semi-automatic fire.
• Flamethrower (£750, 10 blocks) - A flame-spewing weapon that can set multiple Zeds on fire. Flames travel in an arc but will only affect Zeds in the area around where it lands.
• Husk Fireball Launcher (£4000, 8 blocks) - The Husk's weapon modified for human use, it takes more ammo the longer it charges, but deals explosive incendiary damage at the point of impact. It can be fired without charging, but at less damage.
• Dragon's Breath Trenchgun - A WW2 shotgun that is chambered with incendiary shells, dealing fire damage even with other perks.
• Flare Revolver - A DLC revolver that fires flares setting zeds on fire. Can only be purchased if the player has bought the Community Weapons Pack.

Sharpshooter (Pistols and Marksman Weapons)

• Mk.23 (£500, 2 blocks / £1000, 4 blocks for akimbo) - More powerful than the 9mm pistol, but with a slower reload while dual-wielding.
• .44 Magnum (£450, 4 blocks / £900, 4 blocks for akimbo) - A slightly cheaper and weaker Handcannon with a faster rate of fire, slower reload and lower ammo capacity.
• Handcannon (£500, 4 blocks / £1000, and 4 blocks for akimbo) - Powerful, accurate pistol that can be dual-wielded to take on powerful specimen at the cost of expense, speed, and recoil. Spawns randomly on maps.
• Lever-Action Rifle (£200, 6 blocks) - The cheapest primary weapon that does decent damage with a high rate of fire. Spawns randomly on maps.
• Compound Crossbow (£400, 10 blocks) - Powerful scoped single-shot bow that does incredible headshot damage.
• M14 Enhanced Battle Rifle (£2500, 5 blocks) - Light-weight semi-automatic battle rifle with a large magazine and quick rate of fire. Alternate fire toggles its laser sight.
• M99 AMR (£3500, 13 blocks) - The most powerful rifle in the game, with the ability to 1-shot almost every Zed.

Support Specialist (Shotguns)

• Shotgun (£500, 8 blocks) - Standard 12-gauge pump-action shotgun with a large magazine and quick reload times. Also has a built-in flashlight. Spawns randomly on maps.
• Combat Shotgun (£2500, 8 blocks) - A fast-firing semi-automatic shotgun that holds up to 6 shells at a time. Also has a built-in flashlight.
• Hunting Shotgun (£750, 10 blocks) - A powerful close-ranged double-barreled shotgun. Alternate fire shoots both barrels at once.
• HSG-1 Shotgun (£1250, 6 blocks) - A lightweight shotgun that uses magazines instead of individual cartridges. Alternate fire toggles between a tight spread and a wide spread for its shots.
• AA12 Auto Shotgun (£4000, 10 blocks) - Fully-automatic combat shotgun that sacrifices single-shot damage for better accuracy, lower spread, and high rate of fire. Alternate fire switches it between fully-automatic and semi-automatic.
• Vlad 9000 - A modified nailgun with nails that can ricochet on walls. It has a built-in flashlight, and uses magazines instead of individual cartridges. If shot at the ground at a slight angle the nails will bounce along the floor for a great distance, thus making it viable at long-range even if it is weak in damage.

DLC and Updates

Since its original release, Killing Floor has been supported with both free updates and paid downloadable content. Upgrading the game to the latest version adds all content and character packs. However, the paid character packs are locked and are only selectable for players who purchased the content.

The game, plus the first six character packs, was re-released in boxed form as Killing Floor: Gold Edition. Exclusive to this retail version (released online for $29.99 on June 1, 2012) is a timed exclusive of a new female character (Ash Harding), who comes with three female voice packs (English, French, and German) and was released as a special character pack on August 1, 2012.

Paid Content Packs

• Outbreak Character Pack - Released on July 24th, 2009 for $1.99. Unlocks four playable characters: Agent Wilkes, Foundry Worker Albridge, DJ Scully, and Dr. Gary Glover. Also included in the Gold Boxed Edition.

• Nightfall Character Pack - Released on October 22nd, 2009 for $1.99. Unlocks four playable characters: Mr. Foster, Security Officer Thorne, Lance-Corporal Lee Baron, and Mike Noble. Also included in the Gold Boxed Edition.

• Postmortem Character Pack - Released on October 7, 2010 for $1.99. Unlocks four playable characters: Harold Hunt, Kerry Fitzpatrick, Trooper Clive Jenkins, and Paramedic Alfred Anderson. Also included in the Gold Boxed Edition.

• "London's Finest" Character Pack - Released on December 14, 2010 for $1.99. Unlocks four playable characters: Chopper Harris, Kevo the Chav, Captain Wiggins, and Reverend Alberts. Also included in the Gold Boxed Edition.

• Steampunk Character Pack - Released on July 2, 2011 for $1.99. Unlocks four playable characters: Reggie "Basher" Clover, Adam Butler, Doctor Dave, and Peter the Assassin. This pack was also available to unlock for 3 tickets via Steam's Summer Camp promotion lasting from June 30th to July 10th, 2011. Also included in the Gold Boxed Edition.

• Steampunk Character Pack 2 - Released on December 7, 2011 for $1.99. Unlocks four playable characters: Steampunk DJ Scully, Steampunk Demolition, Steampunk Support Specialist, and Steampunk Commando. Also included in the Gold Boxed Edition.

• Urban Nightmare Character Pack - Released on July 5, 2012 for $1.99. Unlocks four playable characters: Dave "The Butcher" Roberts, Dr. Jeffrey Tamm, Fireman Sam Avalon, and Shadow Ferret.

• Harold Lott Character Pack - Released on July 5, 2012 for $4.99. Unlocks one playable character: Harold Lott.

• Ash Harding Character Pack - Released on August 10, 2012 for $4.99. Unlocks one playable character: Ash Harding. This character was originally exclusive to the Gold Boxed Edition of Killing Floor (which was released on June 1, 2012) and includes three new female voice packs for the character (in English, French, and German).

• The Chickenator Pack - Released on October 23, 2012 for $4.99. Unlocks one playable character: The Chickenator.

• Community Weapon Pack - Released on October 23, 2012 for $7.99. Allows the player to purchase four weapons: Scythe, Tommy Gun, Flare Revolver, and Buzzsaw Bow. As the name implies these weapons were created by a modding team to which all profits made from this DLC go to. This is similar to Tripwire Interactive's handling of Rising Storm.

• Robot Special Character Pack - Released on December 13, 2012 for $4.99. Unlocks one playable character: Domestic Assistance Robot (D.A.R.), who includes its own robotic voice pack.

• Golden Weapons Pack - Released on December 13, 2012 for $7.99. Allows the player to purchase four weapons: Golden AK-47, Golden Combat Shotgun, Golden Katana, and Golden M79. This DLC is simply a skin pack for those weapons as all the weapons in this DLC have the same stats as their non-gold versions.

Cross-Promotional Characters

• The Ball - Players who pre-ordered The Ball (prior to its October 26, 2010 release) received the game's protagonist in Killing Floor (given the name Harchier Spebbington).

• Team Fortress 2 - Players who own both Killing Floor and Team Fortress 2 (prior to January 4, 2011) received two bonus characters in Killing Floor: RED Pyro and BLU Pyro. (In contrast, players also receive promotional cosmetic gear for the Pyro in Team Fortress 2 resembling Mr. Foster).

• Red Orchestra 2: Heroes of Stalingrad - Players who purchase the Steam Digital Deluxe Edition of Red Orchestra 2: Heroes of Stalingrad receive two bonus characters: World War II re-enactors Nikolay (wearing a Russian uniform) and George (wearing a German uniform).

Free Content Packs and Special Events

Since the game's release, free updates have been released as downloadable content. Along with the standard gameplay tweaks and enhancements, all of these updates add new maps to the base game. Most of these updates also add new weapons and Steam achievements, as well as special seasonal tweaks (such as enemy appearance).

• Heavy Metal Content Pack - Released on August 20th, 2009. Added one new map (Foundry) and two new weapons (AK-47 and Katana).

• Level Up Content Pack - Released on October 22nd, 2009. Added one new perk (the Demolition perk), a sixth level to all perks, three new maps (Bedlam, Wyre, and Waterworks), a new specimen (the Husk), seven new weapons (MP7 Medic Gun, AA12 Auto Shotgun, M14 Enhanced Battle Rifle, SCAR Mk17 Assault Rifle, Pipebomb Proximity Charge, M79 Grenade Launcher, and M32 Multiple Grenade Launcher), and new Steam achievements.

• Grindhouse Competition Pack - Released on December 11, 2009. Added four new maps: Icebreaker, Departed, Crash, and Filth's Cross.

• Incendiary Content Pack - Released October 7, 2010. Added four new maps (Hospital Horrors, Biohazard, Mountain Pass, and Suburbia), one new weapon (MAC-10), and a new system for rewarding money (percent of damage done).

• Twisted Christmas Event (2010) - Released on December 14, 2010. Added one new map (Santa's Evil Lair), one new unlockable character (Bill "Baddest Santa" Weeks), new Steam achievements, and a new "hardest" difficulty setting (Hell on Earth). Temporarily re-skinned all monsters with a Christmas theme.

• Potato Sack Promotion - Released on April 12, 2011. Added one new map (Aperture), one new temporary shop item (the expensive £70000 Potato, which only grants an achievement to everybody in the server), a temporary Trader replacement (GlaDOS), and new Steam achievements. The map is based on Portal 2, as the game was part of the Potato Sack promotion.

• Summer Sideshow Event (2011) - Released on June 30, 2011. Added one new map (Abusement Park), one new unlockable character (Steampunk Mr. Foster), and new Steam achievements. Temporarily re-skinned all monsters with a circus theme.

• Halloween Sideshow Event (2011) - Released on October 27, 2011. Added new Steam achievements and one new unlockable character (Commando Chicken). Temporarily re-skinned most monsters with a circus theme (with the rest in a Halloween theme).

• Twisted Christmas Event (2011) - Released on December 7, 2011. Added one new map (Ice Cave), six new weapons (Scottish Claymore, M-4 Carbine, M-4 Carbine with M-203 Grenade Launcher, Combat Shotgun, Husk Fireball Launcher, and MP5 Submachine Gun), and new Steam achievements. Temporarily re-skinned all monsters with a Christmas theme.

• Summer Sideshow Event (2012) - Released on July 5, 2012. Added one new map (Hellride), five new weapons (Mk. 23 Pistol, FN FAL Assault Rifle with ACOG Scope, M7A3 Assault Rifle, HSG-1 Auto Shotgun, and M99 Marksman Rifle), and new Steam achievements. Temporarily re-skinned all monsters with a circus theme.

• Hillbilly Horror Halloween Event - Released on October 23, 2012. Added one new map (Hillbilly Horror), three new weapons (Dragon's Breath Trenchgun, Vlad 9000 Nailgun, and MKb42(h) Assault Rifle), new Steam achievements, and one new unlockable character (The Grim Reaper). Temporarily re-skinned all monsters with a hillbilly theme.

• Twisted Christmas Event IN SPACE - Released on December 12, 2012. Added one new map (Moon Base), three new weapons (Schneidzekk Medic Gun, Zed Eradication Device, and Dwarfs?! Axe), and new Steam achievements. Temporarily re-skinned all monsters with a Christmas theme.

System Requirements

Windows

Mac