What changed in Left 4 Dead 2 in 2011

Added 'I Hate Mountains' to the campaign rotation and updated 'Suicide Blitz 2'.

Introduced a new achievement related to Versus gameplay.

Introduced a new achievement related to Versus mode gameplay.

Resolved the problem of Tanks not consistently spawning during finale events.

Adjusted the distribution of melee weapons in the new campaigns based on community feedback.

Resolved the problem of Tanks not consistently spawning in the finales.

Addressed the issue where players would die upon winning the Death Toll campaign.

Players can now block others from joining their games, enhancing the ability to manage who can play with them.

Added 'I Hate Mountains' to the rotation and updated version of 'Suicide Blitz 2'.

Fixed the issue where players would die when winning the Death Toll campaign.

Players can now block others from joining their games, enhancing the multiplayer experience.

Mixed up the distribution of melee weapons in the new campaigns.

The number of hunting rifle spawns has been reduced in the Confogl update.

Confogl will be available for the entire month of December.

Confogl is a set of rules for competitive L4D2 Versus that standardizes many elements and changes item and weapon distribution.

Reduced scavenge item counts and reduced number of hunting rifle spawns based on community feedback.

The number of scavenge items has been reduced as part of the Confogl update.

Confogl is a set of rules for competitive L4D2 Versus that standardizes elements and changes item and weapon distribution, favoring the Infected.

Confogl will be brought back and left in rotation until the new year for players to adjust.

The only shot that counts is the one in the head. This Mutation is available for Campaign Mode.

Confogl will be brought back and left in rotation until the new year for players to adjust and evaluate.

The only shot that counts is the one in the head. Available for Campaign Mode.

Confogl is a set of rules for competitive L4D2 Versus that standardizes many elements and changes item and weapon distribution, favoring the Infected.

Confogl tips the balance a bit more towards the Infected.

Confogl is a set of rules for competitive L4D2 Versus that standardizes many elements and changes item and weapon distribution.

No respawns, no restarts, no ammo, all tension! A new challenge mode for Expert difficulty.

Charger was voted as the special infected with the biggest impact on L4D1 maps, with 52% of the vote.

Charger voted as the special infected with the biggest impact on L4D1 maps, followed by Spitter and Jockey.

No respawns, no restarts, no ammo, all tension! A new challenge mode for Expert difficulty.

A new mutation for competitive L4D2 Versus that standardizes elements and changes item and weapon distribution.

A new mutation for competitive L4D2 Versus that standardizes rules and changes item and weapon distribution.

Thanks to LarryBrains for Death Toll Finale changes and Rayman1103 for survivor audio suggestions.

Players can now blast the infected to shreds using M60s with unlimited ammo.

Chainsaws can tear apart infected but are loud; swords provide a close combat option.

Chainsaws can tear apart the infected but are loud; swords provide a close combat option.

Thanks to community members for their contributions to the Death Toll Finale and survivor audio.

Players can now blast the infected to shreds using M60s with unlimited ammo.

No health kits available in Versus mode, leading to permanent health reduction for Survivors.

No health kits available in Versus mode, leading to permanent health reduction for Survivors.

Ongoing work to address performance issues to meet benchmarks for the Cold Stream campaign.

The beta version of the Death Toll campaign is now available for players.

The bridge collapse sequence in Blood Harvest has been modified to allow more spawning area for Infected and fix an exploit.

Changes to the finale are being tested, with plans to refine based on player feedback.

Adjusted the bridge collapse sequence to allow Infected more spawning area and fix an exploit.

A change to the finale is being tested and will be refined based on player feedback.

The beta version of the Death Toll campaign is now available for players to test.

Ongoing work to address performance issues in the Cold Stream Campaign.

A new Coop Mutation featuring non-stop hunters, providing practice on stopping hunter pounces.

A new Coop Mutation featuring non-stop hunters, allowing players to practice stopping hunter pounces.

Testing for the Cold Stream DLC has started with the PC community, focusing on Blood Harvest.

PC community starts testing the Cold Stream DLC, with adjustments being made based on feedback.

Next set of Mutations will feature the top 4 as voted by players based on playtime.

Players can now heal by holding the Gnome, which has magical healing properties.

The next set of Mutations will feature the top 4 as voted by players based on their playtime.

Players can heal by holding the Gnome, which has magical healing properties.

Spawn distances in the finale have been adjusted to match player preferences.

A new mutation mode where all players spawn as Tanks.

Spawn distances in the finale have been adjusted to match player preferences.

A new mutation mode where all players spawn as Tanks.

Players can vote on whether to cycle through the top 4 Mutations or continue in order.

Players can vote on whether to cycle through the top 4 Mutations or continue in order.

A new Coop Mutation featuring non-stop hunters with no other special infected.

Poll results indicate 50% of players find The Train Station map too easy, while 27% think it's fine and 23% haven't played it.

A new Coop Mutation featuring non-stop hunters with no other special infected.

Poll results indicate that 50% of players find The Train Station map too easy, while 27% think it's fine and 23% haven't played it.

More maps from Left 4 Dead 1 are being adapted for Left 4 Dead 2 gameplay.

New gameplay mode where teams compete to beat each other's survival times.

A new game mode where teams compete to beat each other's survival times.

More maps from Left 4 Dead 1 are being adapted for Left 4 Dead 2 gameplay.

Poll results indicate 84% approval for the end bunker in Cold Stream's first map among players who experienced it.

Changes made to the starting position of Blood Harvest to prevent easy charges leading to player deaths.

Adjustments made to the start position of Blood Harvest to prevent easy charges off the map.

Upcoming DLC featuring the Midnight Riders without a story tie-in.

A new simplified game mode where all players spawn as Tanks.

Fixed bugs and exploits on Cold Stream maps; added new experimental features.

Fixed multiple bugs and exploits on Cold Stream maps during public testing.

A new game mode where all players spawn as Tanks.

Announcement of an upcoming DLC featuring the Midnight Riders without a story tie-in.

Added two experimental features: a new end for the first map and an alternate route around the mast.

Tier 2 weapons will be placed unpredictably in Map 2, followed by Map 1.

New gameplay mode where teams compete to beat each other's times.

Tier 2 weapons will be placed unpredictably in Map 2 and Map 1 based on community feedback.

New gameplay mode where teams compete to beat each other's survival times.

Become the last human survivor with no split screen help or Survivor bots, facing Special Infected alone.

Based on community feedback, tier one weapons will remain available at the start of the game.

Based on community feedback, tier one weapons will remain available as players start.

Poll conducted regarding the placement of tier 2 weapons in a 4 map campaign, with options for unpredictability or consistency.

Poll results will influence the placement of tier two weapons in a 4 map campaign, with options for unpredictability or consistency.

You are the only Survivor left in the world, hunted by Special Infected in Single Player Mode.

New campaign mode where players must carry a garden gnome while being swarmed by infected.

Introduction of the Cold Stream Beta campaign, currently a work in progress.

An SMG spawn was added to the Cold Stream Beta to assist players in the lengthy intro map.

Introduction of the Cold Stream Beta campaign, featuring an updated weapon spawn.

Community feedback on playing Scavenge in original Left 4 Dead campaigns.

An SMG spawn was added to the intro map to provide players with better starting weapons.

Poll results indicate player interest in Scavenge mode for original Left 4 Dead campaigns.

New campaign mode where players must carry a garden gnome while being swarmed by infected.

Players must be by the radio headset to start the finale map.

Cold Stream will be part of an upcoming DLC for L4D2, with no release date or pricing announced.

Players can vote to restart a chapter if they encounter problems with a spawn room.

All players must be by the radio headset to start the finale map.

The in-game bug reporter for L4D2 has been activated, allowing players to submit bugs on Valve maps including Cold Stream.

Players can now submit bugs on Valve maps including Cold Stream.

The beta version of Cold Stream has been released, showcasing a more polished initial look.

Initial beta version of the Cold Stream campaign released for feedback and bug reporting.

Players can vote to restart chapters if they encounter problems with spawn rooms.

Cold Stream is part of an upcoming DLC for L4D2, with no release date or pricing announced.

Players are encouraged to play the campaign and provide feedback, especially regarding the finale.

Scavenge one can at a time, with Infected knowing the can locations.

Original Left 4 Dead campaigns will be available for Scavenge mode in Left 4 Dead 2.

Players can play Scavenge in the original Left 4 Dead campaigns once ported to Left 4 Dead 2.

A new mutation that spawns only one group of cans at a time in Scavenge mode.

Community poll to determine favorite NPCs in the game.

A new Co-op Mutation where players die immediately upon going down, emphasizing teamwork and caution.

Results from a poll regarding reasons for vote kicking, highlighting team killers as a top priority.

Updated voting system to prioritize kicking team killers based on community feedback.

A new Co-op Mutation that features instant death upon going down, emphasizing teamwork and caution against friendly fire.

A new Survival Mutation featuring commons, beefed up Specials, no glows, and lots of fog.

A new Survival Mutation featuring commons, beefed up Specials, no glows, and lots of fog.

In-game poll to gather reasons for vote kicking.

This week's new Mutation based on community voting results.

Introduction of a new community Mutation based on player votes, with a focus on new content this week.

In-game poll to gather reasons for vote kicking among players.

Jockeys now have increased health, speed, and damage in the new mutation.

Community campaigns can be included in future DLC packages for Xbox 360.

The current featured campaign for PC users has been updated to One 4 Nine.

The current featured campaign for PC users has been updated to One 4 Nine.

New Versus Mutation featuring Jockeys with increased health, speed, and damage.

Community campaigns can be included in future DLC packages for Xbox 360.

A new Versus Mutation focused on Jockeys with increased health, speed, and damage.

Jockeys have increased health, speed, and damage in the Riding My Survivor Mutation.

New campaign by Kev Edwards set in an Army base in the Nevada desert with coop and survival modes available.

The new featured campaign is Kev Edwards’ One 4 Nine, set in an Army base in the Nevada desert with an ancient alien tomb.