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>.

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 click this link.

<img src="http://www.l4d.com/blog/images/posts/051/gibs.png">

<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.

Gib Fest
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.

<a href="http://www.l4d.com/coldstream"><img src="http://www.l4d.com/blog/images/posts/090/coldstream_available.gif" width="440" height="497" border="0"></a>

<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="http://www.l4d.com/coldstream">Cold Stream Update page</a> – we just missed one – to celebrate the launch of Cold Stream – <a href="http://store.steampowered.com/app/550/">Left 4 Dead 2 is 75% off on Steam</a>! Time to introduce some new friends to the Zombie Apocalypse.

<a href="http://www.l4d.com/coldstream">Visit the Cold Stream Update page</a>.

Cold Stream Is Out!

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 Cold Stream Update page – we just missed one – to celebrate the launch of Cold Stream – Left 4 Dead 2 is 75% off on Steam! Time to introduce some new friends to the Zombie Apocalypse.

Visit the Cold Stream Update page.

<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?