<b>Nightmare</b>
You’ll never see them coming

This Survival Mutation was inspired by Karma Jockey. There are commons, plenty of beefed up Specials, no glows, and lots and lots of fog. If you like to be scared by things that jump out at you from the night, this one is for you.

<b>What do Zombies Think?</b>
While cleaning/moving our offices around (all our desks at Valve are on wheels so we can have desk races), we discovered this old, long ago used Zombie decision making tree. It was created before our session with Mike Patton to record the common zombie sounds. While it is near indecipherable gibberish thanks to bad penmanship, it shows not at an AI level how a zombie behaves but all the speech opportunities and transitions.

Our favorite is the top. Lay Down? Nope. Want to vomit? Sure.

<img src="http://media.steampowered.com/apps/l4d/images/chart_thumb1.jpg">

Nightmare
You’ll never see them coming

This Survival Mutation was inspired by Karma Jockey. There are commons, plenty of beefed up Specials, no glows, and lots and lots of fog. If you like to be scared by things that jump out at you from the night, this one is for you.

What do Zombies Think?
While cleaning/moving our offices around (all our desks at Valve are on wheels so we can have desk races), we discovered this old, long ago used Zombie decision making tree. It was created before our session with Mike Patton to record the common zombie sounds. While it is near indecipherable gibberish thanks to bad penmanship, it shows not at an AI level how a zombie behaves but all the speech opportunities and transitions.

Our favorite is the top. Lay Down? Nope. Want to vomit? Sure.

<b>Flu Season</b>
The smell of spit and bile in the air.

This Coop Mutation is a mashup of "Boomer Shooter" by SR69MMJC and "Spitters!" by Karma Jockey. The only specials are Boomers and Spitters. The only commons are the result of the Boomer. The only other change is we amped up everything about these two Specials. But don’t worry you’ll be okay as long as you avoid all the goo flying in the air.

<b>PAX?</b>
PAX Prime is taking place this year from August 31st to Sept 2nd. It is a great event filled with gaming and gaming culture. While the tickets have already sold out, we are curious to know how many L4D players will be visiting. So the question is simple – will you be attending PAX Prime this year?

Flu Season
The smell of spit and bile in the air.

This Coop Mutation is a mashup of "Boomer Shooter" by SR69MMJC and "Spitters!" by Karma Jockey. The only specials are Boomers and Spitters. The only commons are the result of the Boomer. The only other change is we amped up everything about these two Specials. But don’t worry you’ll be okay as long as you avoid all the goo flying in the air.

PAX?
PAX Prime is taking place this year from August 31st to Sept 2nd. It is a great event filled with gaming and gaming culture. While the tickets have already sold out, we are curious to know how many L4D players will be visiting. So the question is simple – will you be attending PAX Prime this year?

<b>Last Man On Earth</b>
You will become legend to the infected as the last human left.

You are the only Survivor left in the world. No split screen help. No Survivor bots. But don't worry you aren't entirely alone. While there are no common Infected, Special Infected will hunt you down and become close, close friends with you.

<b>Loners?</b>
While the first part of this blog post should make the results of our last poll obvious, the second place finisher is just as interesting. Between Lone Gunman and "scared to play alone," seems about 30% of you are "scared to play alone" – putting that choice in second place. With that being true, today is a great day to overcome that fear and play Left 4 Dead 2 alone with Last Man On Earth.

After all, it is Friday the 13th, what could happen?

Last Man On Earth
You will become legend to the infected as the last human left.

You are the only Survivor left in the world. No split screen help. No Survivor bots. But don't worry you aren't entirely alone. While there are no common Infected, Special Infected will hunt you down and become close, close friends with you.

Loners?
While the first part of this blog post should make the results of our last poll obvious, the second place finisher is just as interesting. Between Lone Gunman and "scared to play alone," seems about 30% of you are "scared to play alone" – putting that choice in second place. With that being true, today is a great day to overcome that fear and play Left 4 Dead 2 alone with Last Man On Earth.

After all, it is Friday the 13th, what could happen?

<b>Versus Survival</b>
The first Survivor team sets the time. The second team tries to beat it. Then the first team tries to beat the second team's time. Then the second team tries to beat the first team's time. And then the... you get the idea. Rounds keep switching until someone fails to beat the previous time.

This is a great way to try Versus. Rounds are only as long as you can keep beating each other’s times. There are no rushing Survivors. Infected spawns get quicker as the time increases. It is mayhem filled with all the weapon perks and items. What’s not to like? Give it a try.

<b>Next Mutation For the Loners?</b>
For the next mutation, do you prefer Lone Gunman or Last Man on Earth? Let us know.

Versus Survival
The first Survivor team sets the time. The second team tries to beat it. Then the first team tries to beat the second team's time. Then the second team tries to beat the first team's time. And then the... you get the idea. Rounds keep switching until someone fails to beat the previous time.

This is a great way to try Versus. Rounds are only as long as you can keep beating each other’s times. There are no rushing Survivors. Infected spawns get quicker as the time increases. It is mayhem filled with all the weapon perks and items. What’s not to like? Give it a try.

Next Mutation For the Loners?
For the next mutation, do you prefer Lone Gunman or Last Man on Earth? Let us know.

<b>Four Swordsmen of the Apocalypse</b>
Four Swords against plenty of apocalypse!

Armed with only swords the survivors face near continuous streams of Special Infected ready to be sliced and diced.

<b>DLC Date</b>
Now that we have a solid version of the maps (some minor changes still coming), we are focused on the DLC and getting some pesky bugs out of the shipping version. As soon as we have a release date we will let you know.

<b>Upcoming Mutations</b>
Thursday we <a href ="https://twitter.com/#!/l4ddev">tweeted</a> out a request for the next mutation. Minutes later we had a request for Four Swordsmen and just as we said it aloud we decided to load it up and check it – it had been awhile and we have some new members of our team.

Four hours later we realized we better ship this since it‘s what we tested. So while it only has three votes, we will take the top tweets for upcoming Mutations. Right now we are leaning towards Versus Survival. A team favorite as well.

Four Swordsmen of the Apocalypse
Four Swords against plenty of apocalypse!

Armed with only swords the survivors face near continuous streams of Special Infected ready to be sliced and diced.

DLC Date
Now that we have a solid version of the maps (some minor changes still coming), we are focused on the DLC and getting some pesky bugs out of the shipping version. As soon as we have a release date we will let you know.

Upcoming Mutations
Thursday we tweeted out a request for the next mutation. Minutes later we had a request for Four Swordsmen and just as we said it aloud we decided to load it up and check it – it had been awhile and we have some new members of our team.

Four hours later we realized we better ship this since it‘s what we tested. So while it only has three votes, we will take the top tweets for upcoming Mutations. Right now we are leaning towards Versus Survival. A team favorite as well.