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Recommended 'Mutation' Mods.
Mutation mods for Left 4 Dead 2.
EXtreme-Gcarranza30 v.12.3
EXtreme-Gcarranza30 v.12.3

The full description of the mod is in the web and is in the changelog.
as animated sidepanel blue , Nine inventory slots ; among others.

visited website.please my page Facebook.

  04/15/2014Version: 12.3 (complete) Views: 4321 By: Gcarranza30/Urik_Kane/Rayman1103/Miss_yoselin L4D2
Kinder Boomers:MegaSpewFest
Kinder Boomers:MegaSpewFest

Kinder Boomers = Slower Boomer speed and Less Chundering!
a small but new and friendlier play on my first Mega Boomr Spew Fest mutation.
Friendly Fire has been disabled, so no more death by the hands of the bots in Single Player!
A few less numbers of Common Infected but they still only go down with a Decapitation or Headshot.
Infinite ammo is still enabled so no need for reloading in the middle of a spew fight.

  04/07/2014Version: 1.1 (final) Views: 428 By: Dr Morph! L4D2
MegaBoomrSpewFest
MegaBoomrSpewFest

a fun filled mod/mutation with bucket loads of Boomer Spewies!
Many Boomers... many many MANY Boomers. mix them in with copious amounts of slow shamblers, and it's garanteed a hard but fun slog through the world of Left4Dead2.
Did i mention that the Boomers are super quick and they chunder as if they have a never ending supply? and that the slow-shamblers only go down with a headshot or decapitation. infinite ammo enabled bacuse you'll need that "perk". no time for reloading! up to 9 Boomers onscreen at one time and more than 80 common infected as well. this mod may require the use of a good gaming rig due to the sheer number of boomer explosions, Boomers & infected onscreen at once

  04/06/2014Version: 1 (final) Views: 880 By: Dr Morph! L4D2
Undead Overrun- A Mutation
Undead Overrun- A Mutation

"Undead 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?
Can pull off headshots without looking?
Put it all to the test in "Undead Overrun", a mod that employs the same set of skills as "All Alone" in a very different way.
You can read the full list of gameplay effects and changes in the changelog.

  03/29/2014Version: 1.0 (complete) Views: 1143 By: A_fine_mentlegen L4D2
Boss
Boss

3 boss related mutations: Wandering Witches, Serious Survivor and Serious Survivors.

1) Wandering Witches: Your job is simple: make your way - avoiding the Wondering Witch - to the escape point. Don't try to startle Witches. They are faster than you and your Magnum is all but useless against them. Finales? You're automatically attacked by Witches. So, I don't know...

2/3) Serious Survivor/Survivors: Your job is simple: kill a serious number of Tanks in your way to the escape point. Tanks don't throw rocks, but they do throw cars. You can kill them easily, but if you let them close or you don't watch out for flying cars, you are dead. Seriously.

  03/05/2014Version: 1.01 (complete) Views: 3032 By: Elektron L4D2
zombie realism (r.e.2 style)
zombie realism (r.e.2 style)

infected now act like true infected from zombie movies,books, games etc. where they are extremely hard to kill without a head shot, unless you use a powerful weapon like a sniper or melee against them. it also slows them down slightly, just felt like they were way to fast at times before, and makes them more aware of their surrounds so you can't just go right up to them and hack there heads off. so anyone else who hated how much of an advantage the game gave to the survivors then this is the mod for you.

to use with re2 campaign(claire/leon/campaign not included):
on map start type ~ (make sure console is enabled)
kick ellis
kick coach

  02/20/2014Version: 1.5 (complete) Views: 41973 By: ferretsshadow L4D2
Urik Game Menu (with Rayman's Mutation Mod)
  02/06/2014Version: 1.94 (complete) Views: 26537 By: Urik_Kane, Rayman1103 L4D2
Rayman1103's Mutation Mod
Rayman1103's Mutation Mod

Adds a lot of Custom Mutations created by me and others.

The main-menu has been edited so all Mutations can be created via lobbies, and can be played online at anytime. To play Custom Mutations online, they'll have to be played via a Local Server.

If you don't like the default look of the main-menu, you can try out Urik's Game Menu that contains my Mutation Mod found in the link below as a separate mod.

9.6
  01/08/2014Version: 40.0 (complete) Views: 166637 By: Rayman1103 L4D2
King of the Hill
King of the Hill

It's just like Team Fortress 2!

King of the Hill is a fast-paced 8-player competitive gamemode, similar to the one in TF2. Its goal is to contrast the slow gameplay of versus, while still being fun. The four survivors must get to the point and all four of them have to be standing near the point until the Survivor timer counts down. If at least one survivor gets pulled away by Infected or ventures too far, the Infected timer goes down. Once a timer reaches zero, a team wins.

The gamemode works on c5m2_park and c4m4_milltown_b.

Special thanks to the wonderful playtesters:

Rayman1103
ZeqMacaw
Doktor Haus
haxormode
The Fish
Neil - 119

  10/14/2013Version: 1.0 (complete) Views: 2798 By: Offisir L4D2
Improved L4D Mutation
Improved L4D Mutation

That mutation improves the L4D1 Mutation of Valve. It removes the common infected such as Workers, Mudmen, Clowns, Jimmy Gibbs etc. It boosts too the Tank speed. It is faster than before now. All the L4D2 weapons and infected are gone too. It still needs improvement. If you know the cvar for the Friendly Fire while incapped, the water sprint speed, the reload style of L4D1, let me know.
It is recommended to play it with all custom campaign or maps off. I found that there could be problem with the tank speed.

Special thanks to ℬℒÅℭK★ℜℴℭK ₴ℌѻѻ₮ℇℜ, Ene_Chan, Exsau, ilovemytruesister, Lyecxi and Spike for the help especially with the test of the mutation.

  10/04/2013Version: 1.0 (complete) Views: 3045 By: Ashmore & Valve L4D2
Hardcore
Hardcore

A complex mod adding a new gamemode - Hardcore. No specials or bosses spawn, ammo is severely limited and common infected spawn in much greater amounts. Do not even try to play with bots, for they will run out of resources and day in no time. Try to conserve ammo and make use of melee weaponry. Good luck. Default skins recommended. To play type map MAPNAME hardcore into console. !!!Turn the mod off before playing any other gamemode.

  09/27/2013Version: 1.3 (beta) Views: 6474 By: Anton Shiryaev L4D2
Vampirism
Vampirism

This mutation forces survivors to kill or die.
Your health decays over time and the only way to keep it up is to kill zombies.

The main aim for this mutation was to keep the core gameplay of L4D2 but mix it up by changing one of the most important items in the game. Health kits are gone. The infected are not only the things trying to kill you, but also the things keeping you alive.

You need your team in order to survive, but you need the kills more. How will you play?

Current Healing Amount:
Common = 1HP
Special = 25HP
Witch = 50HP to all survivors
Tank = 100HP to all survivors
Headshots = x2 HP GAIN

Thanks for playing, let me know what you think! :D

  09/05/2013Version: 1.2 (complete) Views: 3798 By: The Fish L4D2
All Alone- A Mutation
All Alone- A Mutation

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. Not very survival-y, is it?
This mod aims to fix that, and make a mutation suited for those lone wolves out there.

I hope you have as much fun playing this mutation as I did making it.
This was largely inspired by Hunter J's *Walking Corpses* mod and I used alot of the same cvars he did, though they all have different values from his.
A full list of gameplay changes and effects can be found in the changelog.

  09/02/2013Version: 1.0 (complete) Views: 3583 By: A_fine_mentlegen L4D2
Biters
Biters


In this co-op mutation, you have to make your way through this horde of "biters". When you get bitten, you start bleeding out. Not only that, but zombies love the smell of blood. They get buffed when you're bitten, so clean your wound quickly. A new gene was introduced, giving immunity to bites. It isn't permanent, and there's no way to control it. Fighting them head-on isn't always the best decision. Good luck.

I'd like to give a special thanks to Skullkan6 for requesting a mutation like this and giving me ideas and motivation to finish it. I'd also like to thank many members of the beta group for helping with the scripting problems I've had along the way.

  08/15/2013Version: 2.2 (complete) Views: 5186 By: Offisir L4D2
Lone Survivor
Lone Survivor

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.

  08/15/2013Version: 2.2 (complete) Views: 9359 By: Offisir L4D2