Community Announcements - Chet
To celebrate Halloween, we are unleashing L4D2 on the world. Starting this Thursday, the entire game will be free to play for the whole weekend. New players can begin pre-loading now. For long time players, it is time to welcome your new found friends and help them survive the zombie apocalypse.

For current players, we created a new achievement. Good Guy Nick - – “Plays games with free weekend players and helps them survive a campaign.” Who is a free weekend player? You’re going to have to talk to each other to find out or you could always let your friends know Left 4 Dead 2 is going to be free this weekend and have them join you. Spread the word! It’s the zombie apocalypse, bring friends.

To preload or install the game, you can <a href='steam://install/550'>click this link</a>.
Community Announcements - the gish
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<b>Gib Fest</b>
Blast the infected to shreds with M60s.

Swords can slice up some fun. Chainsaws can tear apart the infected. But you need to get close for both and well… chainsaws are really loud! Time to go with the ultimate gun, you and three friends armed with M60s and unlimited ammo. This is going to get messy.

Jul 24, 2012
Community Announcements - SZ
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<strong>Cold Stream Is Out!</strong>

For PC players, we have some map updates that move the big Beta needle to Release. For Xbox 360 players sorry but the Cold Stream DLC on the Xbox 360 is going to be delayed until next week.

We have almost all the details available here on our <a href="">Cold Stream Update page</a> – we just missed one – to celebrate the launch of Cold Stream – <a href="">Left 4 Dead 2 is 75% off on Steam</a>! Time to introduce some new friends to the Zombie Apocalypse.

<a href="">Visit the Cold Stream Update page</a>.
Community Announcements - the gish
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.

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Community Announcements - the gish
<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.

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?
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<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.

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?
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<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.
Community Announcements - the gish
<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 ="!/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.
Community Announcements - the gish
<b>Hard Eight!!</b>
Double the specials, quadruple the fun!

Face eight Special Infected at one time, this is double the standard number! And if that wasn’t trouble enough, we also increase the spawning frequency so it is raining Specials.

Why aren’t you going to give it a try? Scared?

<b>More Cold Stream</b>
Today we are releasing some bug and exploit fixes on the PC for Blood Harvest.

We have to thank everyone for their feedback and help catching these issues and making the campaigns better but we want to give a special thanks to Tabbernaut from the Steam forums for providing a concise lists of issues.

We still have a few minor fixes and performance improvements for the Cold Stream Campaign. We are going to be releasing those changes in a few weeks as the final build for the DLC.

On the 360 side we have been making some additional performance improvements. The finale section of Cold Stream in particular was a sticky area to pull off. Not only do we have to worry about view distances but the way the common infected move and navigate areas.

One of the results of our extensive performance tuning of the Cold Stream campaign is that we will be writing up and sharing some information with modders on improving the performance of their campaigns.

So enjoy Hard Eight and in a few weeks we will have another content update as we prepare Cold Stream to go into the Xbox 360 certification process.

Community Announcements - the gish
<b>Gib Fest</b>
Blast the infected to shreds with M60s.

Swords can slice up some fun. Chainsaws can tear apart the infected. But you need to get close for both and well… chainsaws are really loud! Time to go with the ultimate gun, you and three friends armed with M60s and unlimited ammo. This is going to get messy.

<b>Cold Stream</b>
As we recently posted on our blog, we are busy working on the full Cold Stream DLC which will include Cold Stream, Blood Harvest, Crash Course, Dead Air, Death Toll, and No Mercy. We will be updating Campaigns on Steam with bug fixes as we get ready to ship the DLC.

Check the release notes as the list of fixes is extensive. The Xbox 360 will get Campaigns with the bug fixes at a future date.