Steam Workshop::Many Random Mutations

Created by ryanm2711

https://i.imgur.com/cKVBRWw.gif Description Throughout the game, the difficulty will randomly change. Upon the difficulty being changed, no player will be notified. This can make for some very unique moments with your friends! The times of these changes ar...

Versus Single With Bots

Created by Chlorororororo

This is my first mod that I publish to workshop This addon will provide you a mutation which you can play versus without strangers and your friends The script of the game is based Versus Single by def075 Features: -Bots can activate obstacles -Bots can do ...

TRUE SINGLEPLAYER [deprecated]

Created by Somnician

I am not supporting this mod anymore, updates to the struggle mechanic can be found here: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2566329686 BRING SURVIVAL HORROR INTO LEFT 4 DEAD 2 TRUE SINGLEPLAYER Back from the grind, don't feel like deal...

Overrun Mutation Pack

Created by Fine

"Overrun", another singleplayer mutation mod that aims to bring the survival experience to Left 4 Dead. "All Alone" veterans will be particularly pleased with the challenge this gamemode poses. Mastered the art of sneaking around zombies with melee weapons...

Romero Mod

Created by xaroth8088

The baying of the hordes in the distance always chills my heart. Am I out of ammo? If I run, will I make it next door or just get swarmed? How can we move without getting separated? Oh, God... the tortured moans of the undead again. Lord, how I miss home. ...

Scavenge Single Player Mutation

Created by Nighty

Normal Scavenge mode but on single player How to play : Mutation->Change Mutation->Scavenge Single Player Bot mod used (required if you want to make survivor bot can scavenge): https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2279814689 How to enable...

Versus Survival Single Player Mutation

Created by Nighty

Normal Versus Survival but on single player (Some of custom map might got bug) How to play : Mutation->Change Mutation->Versus Survival Single Player (OPTIONAL)How to enable mod on this mode: 1. Open folder Left 4 Dead 2/left4dead2/cfg/ 2. Open addonconfig...

[Co-op] Common Infected Only Mutations

Created by TommyCD1

Common infected without the bullshit. So what's up with this? This is a set of mutations that I have created for one simple purpose: to have gameplay featuring only common infected. So what's the bullshit you ask? Well, unlike every other "common infected ...

Left 4 Fun Sample Mods

Created by smilzo

This addon contains few sample mods for the Left 4 Fun addon. The contained mods are fully playable and have been made mainly to show how to make L4F mods. The mods are: l4f_normal (normal coop with some minor modifications) l4f_fun (normal coop with few c...

Chaos mod 4 players, with bots

Created by rpahel

No further work will be done on this mod. Every 20 seconds, one of 29 random effects will be chosen and applied to a random player. Good luck and have fun ! Uncompatible with : Mutation: Attack of the Boomers (thanks Dman for finding about it)...

Class-Based Mutation

Created by poM

This is a coop mutation. You will be assigned to a class according to the character you choose. Each class has their unique ability and loadout. There are 4 classes in this mutation, Assault, Medic, Engineer and Sniper. See images for their loadouts. Medic...

L4D2 x10

Created by morganstedmanms

A mutation that multiplies almost everything in the game by 10, including weapon stats, recovery items and infected spawns. Based on the TF2 x10 gamemodes....

unlimited panic

Created by 無くなった雪

A simple mode specifically for those who like to kill zombies. No skill, no special infected(except boomer), only endless panic. They will never stop, we can't keep it, fight a way, and we will have the chance to survive. World War Zombie. It's time to mak...

Hunter Rush

Created by COPPERSRUN

Welcome to Hunter Rush this is a simple mutation where you got 10 hunters and pump shotgun. Same as always you got some tanks but will you see one before you get pounced? This mutation is a great way to get the "Get Skeeted On" achievement or to practice d...

Spite

Created by Daroot Leafstorm

All the tanks you've ran past and left behind have finally caught up to you, and they're mad. And there's lots of tanks. Like, way too many. Type "!killtanks" in chat to kill all tanks, if you would rather not wait for them to die at spots in which you'll ...

CampaignsAchievementAssistant

Created by BurgerKeen

Preface： Wanna unlock achievements but you find yourself not good at aiming? Seek gamer's help on random public match but have no luck? Then you are in the right place here! In this mod, it'll assist you to unlock some achievements that might seem to be ha...

Solo No Bots

Created by aabicus

This was made for Titsonabullsteam ( http://www.youtube.com/user/titsonabullsteam ) so that he could complete The Sacrifice finale, and is made for people who do solo runs. The only change from a regular campaign is the lack of survivor bot allies. (Update...

Left 4 Dead 2 Chaos Mod

Created by Queen Blush

A mutation that causes a random effect to happen every 20 seconds. Yes I know that a chaos mod for this game already exists but I didn't know that while making this and I was too far into it by the time I found out. Known issues: -All visual effects only w...

Hunter City [Mutation]

Created by ☂ℝΔ¿ℕ₂

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ Launch: Main menu ➜ Mutation ➜ Change Mutation ➜ Hunter City ➜ edit settings ➜ server local ➜ invite friends ➜ GO ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ Spec: T1 Survivors at the beginning of the game receive 150 HP. Up t...

Madness Mutation

Created by MomoRamses

Comically large clown hordes and screwed up settings! Very laggy and unbalanced mutation! Created just for fun, don't take it seriously!...

Real Life Mutation

Created by ÑANGA ÑONGO

The Real Life Mutations were created for users who want to play Realism mode without any hub, crosshairs or glowing borders. The NPC players are disabled, that means if you are playing with two friends, then three survivors will be in-game or if you're alo...

Tactical Witch Hunt [Mutation] FIXED v1.3.0

Created by miotojptx

The common infected are replaced with witches whose health are just low enough to be killed with melee weapons. Sneak your way through them to get to the end of the level. Hunters, chargers, and smokers are removed in order to balance the game. Casual Mode...

Expert Survival

Created by WillZepp

Survival mode on Expert. No changes to the gameplay (number of Specials, etc.) have been made, aside from the difficulty now being Expert....

All Alone Mutation Pack

Created by Fine

I wanted to bring the "survival" feel back to Left 4 Dead 2, something I felt it was entirely missing. you have plenty of resources, can carry more bullets than you have room in your pockets, and zombies hit you with the strength of a malicious grapefruit....

More Zombie Types [Mutation]

Created by Tuce

Features 20+ infected variants! Fight a new strand of infected in this intense challenge mode! Survive an unrelenting plague of up to 18 new special infected types as well as military vehicles who are hell bent on exterminating everything, especially you. ...

[mutation]skeeted training

Created by 你

only hunters. Max hunter:1/2/3/4 Respawn Interval:5/5/5/3 Improve si ai from "New special training" !kill kill oneself !kd show K/D Score: ★★★★★★(>=98) ★★★★★(>=95) ★★★★☆(>=90) ★★★★(>=85) ★★★☆(>=80) ★★★(>=75) ★★☆(>=70) ★★(>=65) ★☆(>=60) ★(>=50) ☆(<50)...

Zombie Realism

Created by Zombie Hugger

A mutation made to recreate a L4D1 modification. Romero style zombies, slow and headshots only, mixed with some more realistic friendly fire damage, no special infected, one incapacitation, and a few other changes to make the game more "realistic." Include...

Where Is Everyone?! [Mutation]

Created by AxeKiller6277

Previously known as Ghost Town, this simple mutation will effectively remove ALL zombies (common, uncommon and special*) from any map. It also removes all survivor bots. so you will be alone. Feel free to explore the map without having any interference :) ...

One Smoker Mutation (Alpha)

Created by [FoRcE]army_guy3

Spoiler: You're going to die. (Picture unrelated) I forgot to take a picture. :O...

Hardcore Survivalists (WIP)

Created by Necromancer

7/15/25 - Begun some additional work on the mod finally, after all this time. Looking into what I can do to make this a bit more interesting as well. There are plenty of ideas on the drawing board to help get this in a good place but I would probably have ...

Left 4 Evil - Beta v0.4

Created by Jhoshua K. Wolfox

The world has gone to hell and took you with it. Thousands upon thousands of flesh-eating Walking Dead have filled every street and building, you are one of the few remaining survivors but for how much longer? This mutation is going to make you feel like b...

RAGE VIRUS

Created by Oh my GYATT

Experience the fierce virus outbreak! This mutation brings you intense gameplay experience, filled with hordes of zombies. They're fast, ferocius, and freaking tough so fight tooth and nail for your survival. Rage, rage againts the dying of light! RAGE VIR...

Hunted Buddies Mutation

Created by Watermelon Farmer

Two buddies have nobody but each other to trust, so they might be able to survive this hunter party! This mutation is designed to put two buddies into play and make them completely rely on each other to survive! GAMEPLAY; -No bots -Max 2 human players -No ...

Mutation - Witches World

Created by 可可狸

I think there are too few witches in coop,so I made this for everyone who loves witches. This mod is mutation mod version of Witches World. replace coop version: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3016440126 Gamemode: Witches World Game...

Contagion (Mutation)

Created by BoxFigs

The infection is spreading, and you are not immune. Infected attacks increase your Infection, which depletes over time. Reaching 100% Infection zombifies you (kills you and spawns a Special Infected). The Infected go down more easily, but you have less amm...

Swarm Mode

Created by failzz

Swarm Mode Swarm is a new way to enjoy L4D with more variety and challenge! You can team up with your friends or compete against them in Coop, Versus, Survival, or Survival Versus. You can also test your skills in the "Hardcore" campaign mode, where you on...

CRAZY CHARGERS

Created by Corøna

CHARGERS GOT CRAZY! THEY ARE NOW FASTER AND CAN MOVE FREELY. SO RUN!!! LIGHT VERSION | Version that only adds the base mechanics without any nerf or buff to chargers. This Addon Includes: 1. The base script: for singleplayer and localhosted campaigns. 2. N...

confogl-like coop

Created by def075

this coop mutation is a confogl-like coop game. inspired by confogl versus (https://code.google.com/p/confogl/). NOTE: only supported on Local Server. play: MainMenu - Mutation - confogl-like coop - Play With Friends - Create Lobby(Server Type: Local Serve...

Infection

Created by bruhlord

The infected carry disease, filled with a variety of symptoms. The mysterious disease of the L4D franchise has mutated, leading to symptoms for those who are infected. When a survivor drops to 60% of their health, they are vulnerable. There are currently m...

Mutation: Un-Immune (Now With Versus!)

Created by Rye

CEDA has removed your immunity through expirements and a new outbreak has been released, DON'T GET BIT Finally, this was my biggest project yet, me and Rayman worked hard to get this finished, hope ya'll enjoy, below is a list of what the mutation does NOT...

Mutation: Leap Of Unfaith

Created by Rye

Hunters lurk around every corner... in Leap Of Unfaith, all survivors are only given magnums to fend off against hordes of clawed pouncing Hunters...

Mutation: Homerun

Created by Rye

You only have a baseball bat to deal with a bunch of Chargers... In Homerun, all weapons are replaced with Baseball bats and you are faced against hordes of Chargers (Tanks and Witches are still in the game), Medkits are also there, but no pills or adrenal...

Ghost Busters [Mutation]

Created by devlos

A Mutation mod by Solved! Aka "Timonenluca" Can you Survive the Afterlife? Introduction: This Mutation is a recreation of a alternate doomed left behind world , where all the wandered zombies you ever killed in the last 11 years turn up after death! Turned...

VSLib

Created by Rayman1103

VSLib (VScript Library) is a simple, lightweight library for L4D2's script system. It is a loose collection of classes and functions that work together to provide additional features....

Mutation: Not So Special

Created by Ben Lubar

Special infected aren't so special anymore. This versus mutation makes every special infected that appears during a round the same type. All boomers, all spitters, all chargers, all hunters, all jockeys, or all smokers. Prepare for hunter-hunter-hunter com...

cruelstroke's mod

Created by cruelstroke

This mod contains four new mutations for who wants to play single player or two player game without computer-controlled teammates. LIVE ALONE DIE ALONE Play a single player offline game without computer-controlled teammates. The density of zombies is a lit...

Rat Mode

Created by Regular Dog

Play using Warhammer: Vermintide inspired rules! This is a mutation that can be played on any existing campaign. Currently working on this, there are bugs. Let me know if your console is spitting red text at you. General Changes A focus is placed on the us...

Viral Carrier

Created by Daroot Leafstorm

Viral Carrier is a 4-player arcade style competitive game mode where the friends you fought with now become the enemies you battle against, as you sprint around the Park of The Parish, killing as many viral carriers as possible and racking up the highest s...

Legendary Survivor

Created by PauloTrovisco

Gameplay mode: Mutation Game types: Realism Max players: 1 (Single Player without BOTS) _______________________________ ENGLISH “Either you are the boss, or you will be their doormat.” Become the lone legend of the zombie apocalypse in Realism mode. This m...

Magic Pills

Created by smilzo

This is a multi skin (10 skins) pain pills model based on the original Valve pain pills. It is intended to be used with the Magic Pills Mutation only as it also moves the pills to the throwables inventory slot, so it is advisable to disable this addon when...

Magic Pills Mutation

Created by smilzo

I made this addon to show how you can use the Survivor Abilities feature of the Left 4 Fun addon in a mutation. Description In this mutation you will be fighting the infected hordes with nothing but a pistol and the melee weapons you find on the ground. Bu...

Survivor Abilities Pack

Created by smilzo

A small collection of Survivor Abilities for the Left 4 Fun addon. This is not a standalone addon, this addon requires Left 4 Fun and Left 4 Lib addons to work. How to install Subscribe to this addon Subscribe to the required addons (if you havent already)...

Left 4 Fun

Created by smilzo

You want to change something in the game like increasing/decreasing the number of infected or you want to be able to crawl when you are incapped? You want to increase the melee range and actually hit someone when you swing your axe or you want to jump high...

Endurer Mutation Pack

Created by Blue

This mutation pack gives you three different new gamemodes: Endurer (1 Player) Endurer - NHM (1 Player, no HUD) Enduring (1-4 Players) Each gamemode works fundamentally, and exactly, the same. With no specials and strong but spread out common infected, you...

Top Gun (Mutation)

Created by CWMlolzlz

How good are you? Can you race your friends to being the most powerful mofo in the game? Start with the measly pistol and work you way up to becoming the top gun! Each weapon requires more kills than the last. At certain weapons you will be given a bonus i...

Professional Realism

Created by Olde

Now available for every difficulty level, but the best effect is obtained on Expert. Professional Realism employs all standard Realism rules with a few important changes: No respawns throughout the campaign. If you die, the only way to come back is by defi...

Valve's Lost Mutations PACK

Created by Rye

NOTE!: do NOT download this if you have the following mutations installed! -Valve's Lost Mutations: The Last Samurai -Valve's Lost Mutations: Last Gnome On Earth Versus -Valve's Lost Mutations: Ultra Realism Earlier "The Last Samurai" reached 600+ subscrib...

Mutation: No Re-Entry

Created by Rye

Nobody Survives Forever In this mutation, when you die, you stay dead FOR THE REST OF THE CAMPAIGN!!!!!!!!!!!!!!!!!!!!!!11111!!!!!!!!one!!!!!!!! also Headshots only console code ---> map (mapname) noreentry...

Boomer Peril (Tank Rush mod)

Created by Neil - 119

This mutation is like Tank Rush with a twist: There are only boomers at first, but boomer vomit will attract a mob of tanks. The goal: finish without getting vomited (and if you do get vomited, finish without dying). It may sound simple, but as you will se...

THE WALKING DEAD MUTATION 14.0

Created by H.U.N.K

Here are the modes available TWD CLASSIC HARDCORE Friendly fire activated, if your health reaches 0 you die, reduced ammo, zombies one hit kill you, only head shots kill them, use melee instead. TWD CLASSIC HARD DEFAULT TIMERS Friendly fire activated, if y...

Dynamic Survivors (Mutation)

Created by BIT_BS

This mutation spawns a large number of infected people. All infected people have 1 health. Tank and Spitter is the only special infected person that appears. No weapons other than melee weapons have fallen. Downed survivors can return to the front with 1 s...

Mutation: The floor is lava!

Created by some sort of giant enemy crab

A gang of four near invinicible rapid fire spitters will chase you through the whole map. (Dont use molotovs, They tend to crash the game)...

[Prototype] Saferoom Randomizer

Created by Vinny

A work in progress randomizer mutation that makes saferooms lead to random levels! This is not complete! Expect *MANY* issues with this as time goes on! I have decided to make this addon public while I work on it, because why not?...

Simple Veteran Difficulty (Obsolete Legacy Version)

Created by Olde

True Veteran, a much more accurate version of what this mutation is attempting to be, can be found here. This add-on, the original Veteran mutations, is now defunct and made obsolete, however I will still leave this on the Workshop for archival purposes. V...

Resident Evil Mutation

Created by DEM-03 GENION

Common Infected is slow but it have more HP and do less damage to the survivors Special Infected will spawn but not binding survivors now they have more HP just like a boss you need to fight charger can be shove Tank do 70% damage to the survivors so even ...

Every Mutation At Once

Created by Queen Blush

The title is somewhat a lie. This mutation combines the effects of many of the official mutations into one clusterfuck of an experience. This isn't even remotely fair or doable, if anyone does manage to beat a single level I will be shocked. Changes Tier 1...

Hell on Earth

Created by ͲҒ Jack Bauer ︻デ▬——

Realism, Hard Twelve, Death's Door, temp health only, dynamic health decay, doubled Tank health, all maps can have up to 4 Witches and 2 Tanks, 50% more damage from Commons in Expert, no first aid kits at all but adrenaline is normal, and the safe room hea...

Storm Mode on any map (Mutation)

Created by Queen Blush

Mutation is called "Universal Downpour" This is a mutation that tries to port the storm from Hard Rain to any map the mutation is played on including custom maps(the one features in the screenshots is my campaign 4 Sided Coin). Also includes settings in em...

#VIVO - Mutación

Created by P'El is

Esta mutación es un pequeño tributo a la pelicula #VIVO, el mod cuenta con: - Palanca personalizada a un hacha de hielo (similar a la que se usaba en la pelicula) - 2 supervivientes solamente - Únicamente tiros a la cabeza - No infectados especiales - Muni...

Crash Bandicoot Controls (Mutation)

Created by Queen Blush

A mutation that adds PS1 Crash Bandicoot controls to the game. Very basic ones mind you you can just walk around, jump and spin attack. Also you die in one hit. Custom survivor models aren't supported, they'll still look like the regular survivors (does su...

Cursed 666 Mutation Challenge

Created by Hatsune Miku ♪

You Will Not Survive. If you are up for one of the most painful challenges of your Entire Existence... Then play this if you wanna loose your mind for 2 hours This mutation will control how your run will go, It is completely random! If your gonna try this ...

Cursed 666 Mutation Sound pack 2

Created by Hatsune Miku ♪

Optional Sound Content for The mutation Cursed 666 Mutation Challenge - Changes Include Reversed Audio - Cause why not Some audio has a volume increase Changes to some Infected audio...

Left 4 Edge

Created by Vinny

Left 4 Edge - Freerunning / Parkour mutation I've lost interest in working on this, so I'll just release what's been made Hold crouch while landing or running at max speed to slide Hold jump while sliding and let go of crouch to slidejump Slide jump off a ...

Vanilla+

Created by ^^ Frost Kitty ^^

About 70% more commons, specials and tanks. Be ready, it is for the best of the teams. Includes also additional ammo. This is the easiest difficulty of the Vanilla series. -great thanks to Nescius for making this possible...

Cyber Realism

Created by ^^ Frost Kitty ^^

This is a modified release of already posted mutation(Improved Realism) which can be found in here: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1898844126 All credit goes to Daroot leafstorm who is the original creater of Improved Realism. Mutat...

Offline Multiplayer

Created by Rattian

Function Adds the ability to play Versus, Realism Versus, Versus Survival, Scavenge and other multiplayer mutations offline with AI bots. Note About Server Shutdown Due to a feature that shuts down servers if one of the teams in online modes has no players...

Two of Us Mutations

Created by Pachurii

"It's just the two of us now kid!" "Shit! It's just you and me! Hang tough." Adds Three mutations for Two players, intended to push the teamwork factor of Left 4 Dead further. It is highly recommended to play with a friend as the bot is not much help, alth...

Last of us Mutation

Created by ExPR

"I have not... Come this far... To die now." HUGE UPDATE FOR ALL OF YOU GUYS Introducing Last of Us Mutation This is a two-player mutation, similar to the Last of us Series where two remaining survivors must survive the apocalypse. With the onslaught of ho...

A tough coop

Created by Mike_HDF

Cooperative mode mutation configurable via a few chat commands. All the information for the configuration is accessible by writing in the game chat: !show_cfg Chat text also appears on the game console. Options in version 1.6: A: Messages in Spanish. If no...

JKY-173 (Mutation)

Created by Queen Blush

A singleplayer mutation that has an invincible 5 times speed jockey chase you the entire map that insta-kills you the moment he touches you. However, he can only move when you aren't looking at him. So he's pretty much a weeping angel (or SCP-173(or Securi...

Gore Gauntlet Mutation

Created by Yoovy

Theres no end to them, they'll never stop coming for you, this is the Gore Gauntlet. This mutation constantly sends hordes of common infected, specials, and even tanks to hunt you down and kill you! --- Mutation Changes --- Due to the extensive list of cha...

Teleporter Rounds (Mutation)

Created by Queen Blush

A singleplayer mutation where you are equipped with a hunting rifle with perfect accuracy and infinite ammo. However wherever your bullet lands, that's where you get teleported to. Could be used a speedrun mutation ig so your times are stored in left4dead2...

Crash Bandicoot Controls (xdR) [Mutation]

Created by EnergyFlamer [COMM OPEN]

This is the xdR version of ChimiChamo's Crash Bandicoot mutation for those who want custom survivor models in this mutation rather than the regular survivors. While this iteration features fewer common infected and lacks Spitters and Smokers, resulting in ...

One Manned Army (Mutation)

Created by Queen Blush

A simple singleplayer co-op mutation where bots copy the player's actions, for better or for worse. Would probably recommend admin system or something similar for this....

REALLY Bad Internet Simulator (Mutation)

Created by Queen Blush

A mutation that simulates playing L4D2 from the ISS....

Hardcore Realism (Beta)

Created by RainLovesCats

Note: I am currently in the process of readding the mod preview images and updating the mod description, as they were outdated by about two years. Updated on 12/17/2022: Released a working beta version for community feedback. Hardcore Realism is a mutation...

Foggy Vision Realism

Created by AlwaysToast

Foggy Vision Realism Mutation Fog will limit your vision to just a few feet. Realism mode enabled. So have fun with that. Blindness from boomers last 5 seconds longer than normal. Lower ammo capacities for guns. To discourage blindly firing into the fog. N...

Foggy Vision Mutation

Created by AlwaysToast

Foggy Vision Mutation Fog will limit your vision to just a few feet. Have fun with that. Blindness from boomers last 5 seconds longer than normal. Lower ammo capacities for guns. To discourage blindly firing into the fog. Note: Does not look good on some c...

Realistic Realism

Created by Tucker

A zombie killing simulation that pushes the boundaries of realism. This mod adds the mutation game mode 'Realistic Realism'. It makes a few changes to realism mode that make the common infected an even bigger threat than they already were. The infected tha...

Schizophrenia

Created by Daroot Leafstorm

Your friends have disappeared, there's a thick fog surrounding you, and you hear and see things that are not there. However, there are definitely some real threats hiding in the fog, waiting for you to make a wrong move. Hope you can tell which infected ar...

Mutation: Attack of the Boomers

Created by some sort of giant enemy crab

Only boomers, getting vomited doubles their spawn rate. Defaults to expert with lowered FF Highly reccomend sniper rifles for killing them (250hp boomers) Credit to Neil - 119 for the base code (boomer peril)...

Lone Survivor

Created by bruhlord

There's no time for friends in this apocalypse. No special infected spawn, but there's a lot more common infected. You spawn with a pack of pain pills and a melee weapon. Good luck. This mutation can be accessed through the main-menu....

Mutation: Tetramagnum

Created by Ben Lubar

Four survivors. Four magnum pistols. That's it. No other guns. No health packs. No special infected, apart from a few boomers. Well, QUITE a few boomers. Stock up on painkillers. You're going to need them....