Lore & History

Killing Floor - The Original Co-op Horror Classic

Killing Floor, also known as KF1, is the original game that launched the entire franchise. Released in 2009 by Tripwire Interactive, this co-operative first-person shooter set the foundation for what would become one of the most beloved co-op horror series in gaming.

Killing Floor key art Killing Floor (2009) key art from the Steam store page.

The Birth of a Legend

Killing Floor started as a mod for Unreal Tournament 2004 before becoming a standalone commercial release. The game's dark, gritty atmosphere and intense co-op gameplay quickly gained a dedicated following.

The Story

Set in the United Kingdom, Killing Floor follows a group of mercenaries fighting against cloned specimens called "Zeds" created by the Horzine Biotech corporation. The outbreak has spread across the country, and it's up to you and your team to survive wave after wave of increasingly difficult enemies.

Core Gameplay

Killing Floor's gameplay is deceptively simple but incredibly addictive:

  1. Survive 10 waves of Zeds (or fewer on lower difficulties)
  2. Earn money by killing enemies
  3. Buy weapons and armor between waves
  4. Face the Patriarch - The final boss who appears in the last wave
  5. Level up your perks to unlock new weapons and abilities

What Makes KF1 Special

  • Dark, atmospheric maps - From abandoned London streets to creepy laboratories
  • Unique perk system - 7 distinct classes with 6 levels each
  • Tactical gameplay - Teamwork is essential for survival
  • Modding support - Extensive custom content community
  • Classic feel - The original horror atmosphere that many fans prefer

Perks (Classes)

Commando perk art Commando, the assault rifle perk that sees cloaked Stalkers.

Killing Floor features 7 unique perks:

  • Berserker: Melee specialist with high damage resistance
  • Commando: Assault rifle expert with extended Zed Time
  • Support Specialist: Shotgun master who can weld doors shut
  • Field Medic: Healing and buffing specialist
  • Sharpshooter: Sniper rifle expert for precision kills
  • Demolitions: Explosive specialist for crowd control
  • Firebug: Flamethrower specialist for area denial

Each perk has 6 levels, with new weapons and abilities unlocking as you progress.

Weapons & Arsenal

Berserker weapons Berserker weapons: chainsaw, claymore, axes and more.

KF1 features a wide variety of weapons:

  • Melee: Axe, Chainsaw, Katana, Claymore
  • Pistols: 9mm, Handcannon, .44 Magnum
  • Rifles: AK-47, M4, SCAR, Bullpup
  • Shotguns: Shotgun, Hunting Shotgun, Combat Shotgun
  • Sniper rifles: Crossbow, M14, LAR
  • Explosives: Pipe bombs, LAW, M79
  • Special: Flamethrower, MAC-10, Dual Handcannons

Game Modes

Normal Killing Floor Mode

The classic survival mode with 10 waves and a boss.

Objective Mode

Complete specific objectives while fighting Zeds.

Custom Maps

Thousands of community-created maps available through Steam Workshop.

System Requirements

Minimum Requirements

  • OS: Windows XP/Vista
  • RAM: 1 GB
  • Graphics: 64 MB video memory, DX9 compatible
  • Storage: 2 GB free space
  • Sound: DX 8.1 compatible
  • OS: Windows XP/Vista
  • Processor: 2.4 GHz or better
  • RAM: 2 GB
  • Graphics: 128 MB video memory, DX9 compatible, Pixel Shader 2.0
  • Storage: 2 GB free space
  • Sound: EAX-compatible sound card

Where to Buy

Killing Floor is available on:

The game is frequently on sale and very affordable.

Why Play Killing Floor 1 Today?

Even though Killing Floor 2 and 3 exist, KF1 still has a dedicated player base because:

  • Unique atmosphere - Darker and more horror-focused than sequels
  • Classic gameplay - Simpler mechanics that many prefer
  • Active modding scene - Thousands of custom maps and mutators
  • Community servers - Dedicated servers with unique modes
  • Nostalgia - The game that started it all

Tips for New Players

  1. Start on Normal difficulty - Learn the basics first
  2. Stick with your team - Solo play is extremely difficult
  3. Learn each perk's role - Understanding your class is crucial
  4. Save money early - Don't buy expensive weapons on wave 1
  5. Weld doors - Support specialists can weld doors to create chokepoints
  6. Know the Zed types - Each enemy has specific weaknesses
  7. Use Zed Time wisely - It can save your life in tight situations