What changed in Left 4 Dead in 2009

Introduces a recharge timer to balance gameplay.

The second downloadable content (DLC) update for Left 4 Dead, titled Crash Course, will be available on September 29.

A recharge timer for infected teammates has been introduced.

Crash Course delivers a complete Versus mode experience in just 30 minutes, streamlining existing campaigns.

Changes to item spawn behavior have been made for more balanced gameplay.

Added a recharge timer for infected teammates to enhance gameplay balance.

The second downloadable content update for Left 4 Dead, featuring new gameplay and locations.

Modifications made for more balanced gameplay.

Delivers a complete Versus mode experience in just 30 minutes.

Second downloadable content update for Left 4 Dead, available on September 29.

A recharge timer for infected teammates has been added to enhance gameplay balance.

Introduces new single-player, multiplayer, and co-operative gameplay modes.

Crash Course delivers a complete Versus mode experience in just 30 minutes.

Crash Course introduces new single-player, multiplayer, and co-operative gameplay modes.

Changes made to item spawn behavior for more balanced gameplay.

Includes new single-player, multiplayer, and co-operative gameplay.

Crash Course delivers a complete Versus mode experience in just 30 minutes.

Changes made to item spawn behavior for more balanced gameplay.

The second downloadable content (DLC) update for Left 4 Dead, titled 'Crash Course', is now available for Xbox 360 and PC.

The DLC includes new single-player, multiplayer, and co-operative gameplay modes.

Introduces a recharge timer for infected teammates to enhance gameplay balance.

A recharge timer for infected teammates has been added for balanced gameplay.

Delivers a complete Versus mode experience in just 30 minutes.

Modifications made to item spawn behavior for more balanced gameplay.

New DLC delivers single-player, multiplayer, and co-operative gameplay, bridging the gap between 'No Mercy' and 'Death Toll'.

Delivers a complete Versus mode experience in just 30 minutes.

Expands the game universe with new locations and dialogue from the original cast.

Expands the game universe with new locations and dialogue from the original cast.

Item spawn behavior has changed for more balanced gameplay.

New single-player, multiplayer, and co-operative gameplay content set for release in September.

The beta of the Left 4 Dead Authoring Tools is now available for free download for all PC owners.

The beta of the Left 4 Dead Authoring Tools is now available for free download for all PC version owners.

DLC includes new Survival Mode, The Lighthouse Survival map, and 2 new Versus campaigns.

New campaign included in Survival Mode featuring Bill and the gang at the lighthouse.

New clothing item featuring Zoey and Louis available for purchase.

New Survival Mode, The Lighthouse Survival map, and 2 new Versus campaigns added.

A new hoodie featuring a zombie skull design available at The Valve Store.

A new shirt featuring characters Zoey and Louis available at The Valve Store.

New coffee mug available for purchase, themed around the game.

New clothing item available for purchase to celebrate the DLC release.

A coffee mug designed for fans, perfect for late-night zombie fights.

A new campaign included in Survival Mode featuring Bill and the gang.

Players can now choose to start a game on an Official server or the Best Available server.

Players can now choose to start a game on an Official server or the Best Available server.

Change to the melee mechanic in Versus and Survival Mode.

Resolved several server-related issues.

A change to the melee mechanic in Versus to improve gameplay balance.

Fixed various exploits in the game.

Fixed various exploits in the game.

Resolved issues related to server performance.