We are releasing the Left 4 Dead 2 Authoring Tools and Left 4 Dead 2 Add-on Support today.

PLAYERS: If you are not looking to design but play custom campaigns all you need to do is install the add-on support package. Just go into steam and open up the Tools tab. Look for the entry labeled Left 4 Dead 2 - Add-on Support click and install it. This download is sizable, but will update your L4D2 installation to allow running ANY map, including custom maps made for the original Left 4 Dead. Once installed, you do not need to run this application, it will always be active.

We will be updating the Left 4 Dead 2 game UI to include links to this package when applicable but for now please just download it directly. If you see any missing textures or models from your favorite map let us know in the forums.

DESIGNERS: Besides also downloading the above file you will need to download the Left 4 Dead 2 - Authoring Tools. Downloading it will add applications, utilities, and example files that are useful for building L4D2 game add-ons. These are similar to the tools released for Left 4 Dead, but include many updates and new features. Among the most useful are:

Gamemode Logic: Designers can now make a single map that can behave differently depending on the gamemode in which it is being played. This can dramatically reduce the file size of Campaign add-ons, as the same map can be used for Co-op, Versus, Scavenge, and Survival.

Director Logic: Maps can now alter their layout and behavior depending on how "angry" the A.I. director is. The better the Survivors are doing, the angrier the AI Director seems to get. This allows you to base variable paths and other events on the player's skill and current conditions.

Scavenge Mode Support! All the elements map authors need to support Scavenge in their maps. This includes game props as well as a full example in the form of Deadline 2, an updated tutorial campaign.

We have included an updated tutorial to help you get going and as always you can join the discussion on the map designer email list. What we want for New Years is to get to play your custom maps in Left 4 Dead 2.

For the best user experience and to take advantage of the new map and nav mesh formats, Left 4 Dead 1 Map Makers will want to compile Left 4 Dead 2 specific versions of their map in the new tool.

Happy Holidays,

The Left 4 Dead 2 Team

We have upgraded our network infrastructure to better accommodate the huge response to L4D2. 360 players will now have lag-free servers. We've also added more dedicated servers.

We will continue to monitor the situation and add resources as needed.

Thank you for your patience. Now quit reading this, get out there and kill some zombies!

Spike TV just posted their nominees for the 2009 Video Game Awards, and we're proud to announce that Left 4 Dead 2 is up for six awards—Game of the Year, Studio of the Year, Best Xbox 360 Game, Best PC Game, Best Shooter and Best Multiplayer Game. If you've been enjoying L4D2 this week, don't forget to drop into Spike's onine voting center and give us some love!

Due to high demand for L4D2, we decided to move various street dates forward for a coordinated worldwide release—except in the UK, where this was not possible (copies of the game are still arriving).

The good news is that we plan to have everyone in the UK playing Left 4 Dead 2 by Friday morning. Those who pre-ordered in the UK before the worldwide launch have been given access to the game.

The PC version of Left 4 Dead 2, the sequel to the best-selling and critically-acclaimed co-operative multiplayer thriller, is now available via Steam to gamers around the globe. The title will be available for the PC and Xbox 360 at retail stores on Tuesday, November 17th in North America, and worldwide throughout the week. For more information, please visit www.steamgames.com.

The "Dude, Where's My Thumb?" contest is officially closed. Congratulations to contest winner Roland Nagy, who just won himself an extremely limited edition (i.e. one) customized "infected" Xbox 360 for his entry below:

During the production of a game, a lot of concept art gets drawn up, redrawn, thrown away, cursed at, and, occasionally, even used. There's a mountain of this stuff fluttering around the Valve offices, and while the non-artists among us might not know much (anything) about art, we hope we're not embarrassing our artists by saying it looks pretty kickass. So we grabbed some of it off the nearest pile and made it into desktop wallpaper:

For our Left 4 Dead 1 contest giveaway, we gave all you gamers a simple proposition: take a picture of yourself or a friend doing something creative in front of a L4D ad. We were blown away by the inventiveness, humor, and photoshop mastery of some of the replies.