Left 4 Dead Wiki
No Mercy.jpg
No Mercy
Tagline "Curing the Infection... One bullet at a time."
Creator Valve Software
  1. The Apartments
  2. The Subway
  3. The Sewer
  4. The Hospital
  5. Rooftop Finale

"Make your way to Mercy Hospital for a rooftop rescue."

No Mercy is the first campaign in Left 4 Dead and spans five levels.

The first level picks up where the game's introduction cutscene leaves off. The Survivors hear from a passing rescue helicopter they can be evacuated if they make their way to Mercy Hospital. On their trek to safety they encounter Infected-filled apartment buildings, city streets, subway tunnels, and sewers. They discover that Mercy Hospital has been overrun but that there is still a chance of rescue if they can fight their way to the helicopter landing pad on the roof of the hospital.

Below is a complete list of video walkthroughs of the 5 levels:

  1. The Apartments
  2. The Subway
  3. The Sewer Parts 1
    and 2
  4. The Hospital
  5. Rooftop Finale

Please know that the gameplay videos are on each campaign's info page not on each map page.

Official description[]

The No Mercy campaign finds you on the rooftop of an obliterated apartment complex, deep in the heart of the once-thriving metropolis of Fairfield—now completely overrun with hordes of Infected. A voice from a bullhorn calls out from a rescue helicopter: Get to the roof of nearby Mercy Hospital and be airlifted to safety. Even if it means shooting your way through narrow alleys, open sewers and seething waves of zombies to get there.[1]

Left 4 Dead 2[]

With The Sacrifice and Cold Stream DLCs, No Mercy was edited and ported over to Left 4 Dead 2. Thus it included all the new Infected, items and weapons, giving the campaign a whole new experience. Video walkthroughs of the Left 4 Dead 2 version of the campaign and all the changes:

  1. Maps 1 and 2
  2. Map 3
  3. Maps 4 and 5


Main article: Graffiti#No Mercy

Writings on the wall at the end of The Subway.

The Apartments level contains plentiful graffiti. Much of it is located in the safe room and on walls along the way.

The captions are of a despairing nature, for instance, "Hope" is spray painted in large letters to the left of the doorway but someone has added "NO" above it to change it to say "No Hope". "Morbid", "None of you will survive", and "Entire city is Infected, if you can read this, get out" add to the aura of hopelessness.

In the finale, a clue as to Green Flu's nature is provided a written conversation on the wall recording the rapidly condensing passage of time between being bitten and turning into an Infected falling from 5 days to 3 days, 1 day, 2 1/2 hours, and then finally 5 minutes.


The Left 4 Dead demo consisted of The Apartments in its entirety, as well as most of The Subway. The rest of the Subway map could be seen in the demo if players went into Noclip mode.


Left 4 Dead[]

L4d no mercy.jpg
Survive the No Mercy campaign.

L4d noone left behind.jpg
Beat a campaign with all 4 Survivors.

L4d stomach upset.jpg
All Survivors complete a campaign without being vomited on.

L4d saftey first.jpg
Play an entire campaign with no Survivors taking friendly fire damage.

L4d do not disturb.jpg
Sneak past all Witches in a campaign without disturbing one.

L4d zombicidal maniac.jpg
Survive any campaign on Expert.

L4d stand tall.jpg
Survive a campaign without being incapacitated.

L4d what are you trying to prove.jpg
Survive all campaigns on Expert.

L4d unbreakable.jpg
Finish a campaign without being healed by a first aid kit.

L4d nothing special.jpg
Survive a campaign with no Survivors taking damage from Special Infected.

L4d akimbo assassin.jpg
Survive an entire campaign using only pistols.

Left 4 Dead 2[]

Confedaracy of crunches.jpg
Finish a campaign using only melee weapons.

Robbed zombie.jpg
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.

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Kill 10 swampy Mudmen while they are in the water.

Crass menagerie.jpg
Kill one of each Uncommon Infected.

The real deal.jpg
Survive a campaign on Expert difficulty with Realism mode enabled.

Collect 10 items dropped by a Fallen Survivor.

Behind the Scenes[]

No Mercy's lighting effects underwent marked changes during development. Early on, the contrast between light and shade was accentuated. Ambient light in each scene was suppressed making for a dark and ill-lit environment and where there was a light, it was made extremely bright.

Skyscrapers and other buildings in the background appeared unnaturally flat because they were a part of the skybox texture. Since this does not affect gameplay, this may have been done deliberately to speed up the game's development for playtesting purposes. In the final version buildings are rendered as actual brushes and models.

The sky was once a dark blue as compared to the blue/green mix in the final version.

Buildings had most of their lights on. In the final version, only scattered windows are illuminated.


A map of the campaign which spans from The Apartments to Rooftop Finale

  • The working title for this campaign was "Hell Hospital."
  • In common with many other maps in the game, the sound of sporadic machine gun fire can be heard from time to time in the distance. This is evidence that there are other survivors 'out there' in similar straits to those experienced by Bill, Zoey, Louis and Francis. This fact is reinforced subsequently by safe room graffiti and character dialog indicating that the Survivors are following similar escape routes to others who have preceded them.
  • In the game's files, there are unused sound and graphics codes for the Chopper Pilot, for example there is a sound file which has him skyshouting: "Hey down there! I can't get any closer, but if you can get to Mercy Hospital I can take ya to the military outpost up north. You have to get to Mercy Hospital! Call me on the radio when you get there." In another such file has him saying to go to Mercy Hospital because he will no longer risk street level pick-ups after having been attacked and bitten earlier. These files ended up on the cutting room floor as a direct result of Valve changing the campaign's ending in response to playtesting feedback.
  • The rooftop location of Mercy Hospital's helipad is unusual for this part of the United States. High wind conditions and low cloud and snow in winter would render this facility unusable and unsafe for the light helicopters typically used for medical rescue services.
  • Fairfield (2010: pop 507) is a real town in southern Pennsylvania located just outside Gettysburg.
  • Similar to Death Toll's poster, Bill's beret and handling of his weapon are inverted horizontally.
  • In the Left 4 Dead 2 port, there are many more spawn points for guns compared to the original version in Left 4 Dead. There are also the Left 4 Dead 2 exclusive weapons, such as the Grenade Launcher, M60 and melee weapons. There are also Worker Infected and CEDA Worker Infected for the third and fourth maps of the campaign.
  • Zoey has three hands in the campaign's poster, two hands gripping the gun, and her left hand gripping the lower hand.
  • Starting with this campaign in Left 4 Dead: Survivors, the original survivors: Zoey, Louis, Francis, and Bill were replaced with Sara, Blake, Haruka, and Yusuke respectively (same cast in any of the Left 4 Dead 2 campaigns) in every Left 4 Dead campaigns. Although the original main survivors from Left 4 Dead were appeared in The Passing (albeit dubbed in Japanese, minus Bill).
  • The Chopper rotor sound effects are exactly from the V22 Osprey in Half Life and its expansion Opposing Force.


Left 4 Dead Left 4 Dead 2
Achievement Mercy Killer.png No Mercy
The Apartments / The Subway / The Sewer / The Hospital / Rooftop Finale
Achievement Price Chopper.png Dead Center
The Hotel / The Streets / The Mall / The Atrium
Achievement Crash-proof.png Crash Course
The Alleys / The Truck Depot Finale
Achievement Torch Bearer.png The Passing
The Riverbank / The Underground / The Port
Achievement Toll Collector.png Death Toll
The Turnpike / The Drains / The Church / The Town / Boathouse Finale
Achievement Midnight Rider.png Dark Carnival
The Highway / The Fairgrounds / The Coaster / The Barns / The Concert
Achievement Dead Baron.png Dead Air
The Greenhouse / The Crane / The Construction Site / The Terminal / Runway Finale
Achievement Ragin' Cajun.png Swamp Fever
Plank Country / The Swamp / Shanty Town / The Plantation
Achievement Grim Reaper.png Blood Harvest
The Woods / The Tunnel / The Bridge / The Train Station / Farmhouse Finale
Achievement Weatherman.png Hard Rain
The Milltown / The Sugar Mill / Mill Escape / Return To Town / Town Escape
Achievement Supreme Sacrifice.png The Sacrifice
The Docks / The Barge / Port Finale
Achievement Bridge Burner.png The Parish
The Waterfront / The Park / The Cemetery / The Quarter / The Bridge
Non-Canon Campaigns
Achievement Last Stand.png The Last Stand
The Lighthouse
Achievement Stream Crosser.png Cold Stream
Alpine Creek / South Pine Stream / Memorial Bridge / Cut-throat Creek
L4D Random Map Cropped.png Dam It (unfinished)
Orchard / Campground / Dam
Achievement Still Standing.png The Last Stand
The Junkyard / Lighthouse Finale