What changed in Left 4 Dead 2 in 2010

The Witch is now uncrownable, adding a new challenge in Realism mode.

Face eight Special Infected at one time with increased spawning frequency.

User created mutations will be released on both PC and Xbox 360.

Next Mutation will be based on a community mod by Raymond Nondorf.

User created mutations will be released on both PC and Xbox 360.

Face eight Special Infected at one time with increased spawning frequency.

The Witch is now uncrownable, adding a new challenge in Realism mode.

Next Mutation will be based on a community mod by Raymond Nondorf.

Added a glow to the Witch for the Infected team.

Co-op mutation featuring M60s and buckets of blood.

Survivor glow color now corresponds to run speed to help tanks identify targets.

Glow added to the Witch for the Infected team.

Coop mutation featuring M60s and buckets of blood.

Survivor glow color now corresponds to their run speed.

Quicker spawns for the infected in Realism Versus mode.

Quicker spawns for the infected in Realism Versus mode.

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

Halloween costumes for characters like Hunters, Zoeys, Bills, and Rochelles have been introduced.

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

Players can vote for next week's Mutation, including options like Bleedout Versus and Healing Gnome.

Players can check out Halloween costumes for characters like Hunters, Zoeys, Bills, and Rochelles.

Players can vote for next week's mutation from options like Bleedout Versus and Healing Gnome.

A new mutation where Survivor health is temporary and decreases over time, promoting fast-paced gameplay.

New mutation where Survivor health is temporary and ticking down, promoting fast-paced gameplay.

In-game poll for players to vote on Halloween costumes related to the Left 4 Dead universe.

Players can participate in a poll about Halloween costumes related to the Left 4 Dead universe.

A new mutation where players use only the Magnum pistol against hordes and Boomers.

A new mutation where players use only the Magnum pistol against hordes and Boomers.

The final issue of the comic related to The Sacrifice has been released.

The final issue of the comic related to The Sacrifice DLC has been released.

Prices for Left 4 Dead and Left 4 Dead 2 have been significantly reduced.

The Sacrifice DLC is now available for Left 4 Dead and Left 4 Dead 2 on PC and Mac, with Xbox 360 release later.

The Sacrifice DLC is now available for Left 4 Dead and Left 4 Dead 2 on PC and Mac.

Prices for Left 4 Dead and Left 4 Dead 2 have been significantly reduced on Steam.

A new 6 map campaign offering Co-op and Campaign gameplay.

A new 6 map campaign offering Co-op and Campaign gameplay.

Bullets that first pass through an infected character before striking a Survivor are now ignored as friendly fire.

Charger now receives 300 points for any Survivor that is insta-killed and 100 points for any Survivor that is insta-incapped by a charge.

Any infected that causes a Survivor to stumble into a 'ledge hang' situation will receive 50 points.

Any infected that causes a Survivor to stumble into a 'ledge hang' situation will receive 50 points.

Tanks go into a stasis when they spawn, leaving stasis when the human player takes over. Tanks do not attack while in stasis and are invisible but show a glow to the infected team. Tanks in stasis cannot be set on fire.

Bullets that first pass through an infected character before striking a Survivor are now ignored as friendly fire.

Charger now receives 300 points for any Survivor that is insta-killed and 100 points for any Survivor that is insta-incapped by a charge.

Tanks go into a stasis when they spawn, do not attack during stasis, are invisible but show a glow to the infected team, and cannot be set on fire while in stasis.

Players can vote for next week's Encore Mutation in-game.

Survivors cannot use health kits in Versus mode, leading to permanent health reduction.

No health in this versus game, making Survivors' permanent health decrease to zero.

PC players will receive additional Versus updates in the coming week.

No health in this versus game, making it a challenge for Survivors.

PC players will receive additional Versus updates in the coming week.

Players can vote for next week's Encore Mutation in-game.

Community votes on what other games they are playing, with results shared for PC and Xbox 360.

Face eight Special Infected at one time, with increased spawning frequency.

Face eight Special Infected at one time, with increased spawning frequency.

Announcement of the upcoming mutation for next week.

Poll results show preferences for melee weapons on Xbox 360 and PC.

Zombies can only be killed with head shots or decapitation; other hits will only stumble them back.

Experience a new mutation where players are armed with chainsaws to survive against hordes of zombies.

Experience a new mutation where players are armed with chainsaws to survive against hordes of zombies.

Players are encouraged to record and upload their best 60 seconds of gameplay.

Poll results show the Hunter is the most popular Special Infected among players.

Poll results show the Hunter is the most loved Special Infected.

Players are invited to vote for their favorite campaign.

Announcement of the upcoming mutation for next week.

Announcement of the upcoming mutation for next week.

Players are invited to participate in a poll to share their favorite campaign.

You are the only Survivor left in the world with no split screen help or Survivor bots, hunted by Special Infected.

Players are encouraged to record and upload a 60-second video of their gameplay for a chance to be featured.

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

Collecting feedback on player frustrations in Versus Mode.

Based on player poll results, Realism Versus will now be a permanent mode.

Based on community poll results, Realism Versus will become a permanent mode.

Scavenge one can at a time, with only one group of cans spawning at a time.

Scavenge one can at a time, with only one group of cans spawning at a time.

Developers will play with the community over the weekend.

A poll asking if Realism Versus should become a permanent game mode.

Valve developers will be playing the Bleed Out mutation over the weekend on Xbox 360 and PC.

Ellis wins the poll with 43% of the vote, while Nick and Ellis tie among PC users.

A new mutation where players have no permanent health, only temporary health that continuously ticks away.

A new mutation where players have no permanent health, only temporary health that continuously ticks away.

A talking Boomer plushy is now available at the Valve Store.

A poll asking players if Realism Versus should become a permanent game mode.

Ellis wins the poll with 43% of the vote, while PC users are split between Nick and Ellis.

A talking Boomer plushy is now available for purchase at the Valve Store.

Players can now use infected bots in Versus mode.

Players can now use a golf club as a melee weapon.

A new firearm, the M-60, has been added to the game.

The Passing DLC includes ten new achievements for players to unlock.

The Passing DLC features three new maps for players to explore.

In Chainsaw Massacre, players are equipped with a chainsaw with unlimited gas to survive against zombies.

Players can now use infected bots in Versus mode.

The Passing DLC includes ten new achievements for players to unlock.

Survivors face tougher conditions with no item glows, tougher zombies, and instant kill witches.

Weekly game mode events featuring new gameplay modes like 'Realism Versus' and 'Chainsaw Massacre'.

Valve employees will be playing on PC and Xbox 360 to celebrate the launch of The Passing.

The first game add-on for Left 4 Dead 2 introduces new content and gameplay.

Weekly game mode events featuring new gameplay modes like 'Realism Versus' and 'Chainsaw Massacre'.

The M-60 firearm is now available for players.

Players can vote on their favorite Mutation once a month, with the winning Mutation returning the following week.

In Realism Versus, Survivors face tougher conditions with no item glows and instant kill witches, while Infected benefit from these changes.

The first game add-on for Left 4 Dead 2 is now available, featuring new gameplay modes and content.

Players will be armed with a chainsaw with unlimited gas to survive against zombies in Campaign Mode.

Introduction of a new 'uncommon common' zombie class.

New weekly game modes called Mutations are now available.

Introduction of a new zombie class called the fallen survivor.

The Passing DLC includes three new maps for players to explore.

The first game add-on for Left 4 Dead 2 featuring original L4D1 Survivors and new gameplay modes.

Players can now use a golf club as a melee weapon.

The first game add-on for Left 4 Dead 2 featuring original L4D1 Survivors and new gameplay modes.

Left 4 Dead 2's The Passing is coming out next week.

Mixmedia's City 17 map concept inspired by Half-Life 2: Episode One.

Two Midnight Riders songs released for Rock Band.

Jsparakov's Badwater Basin map concept for Left 4 Dead 2.

Jsparakov's Badwater Basin map concept for TF2 and L4D2.

Agnostes created a Left 4 Dead campaign poster for a Wizard of Oz contest.

Two Midnight Riders songs released for Rock Band.

Left 4 Dead 2's The Passing is coming out next week.

Mixmedia's City 17 map concept for Left 4 Dead 2.

Agnostes created a Left 4 Dead campaign poster for a Wizard of Oz contest.

Introducing new characters, weapons, and game modes.

Limited time offer from March 23rd to March 25th.

Includes new content such as a Wicked Witch Bride, a Gargantuan M60, and a Slashing Golf Club.

Meet 3 Left 4 Dead 1 Survivors.

Mac versions will be updated in sync with the Windows versions.

Both games will be released on the OSX operating system for Mac computers through Steam.

The Mac versions of L4D1 and 2 will run in native code, not under emulation software.

The Mac versions of L4D1 and L4D2 will run in native code, not under emulation software.

Players who own Left 4 Dead 2 for Windows will automatically own it for Mac without needing to purchase it again.

Mac and Windows players can play together, with Mac owners able to host their own servers.

Mac and Windows players can play together, with Mac owners able to host their own servers.

Both games will be released on the OSX operating system for Mac computers through Steam.

Players who own Left 4 Dead 2 for Windows will also own it for Mac without needing to purchase it again.

Microsoft is hosting a free multiplayer weekend, allowing Silver account users to access Gold features from January 15th to January 18th.

A new update for PC has been rolled out, with a console version expected soon for Xbox 360 users.

Microsoft is hosting a free multiplayer weekend allowing access to multiplayer features without an Xbox Live Gold account.

New DLC titled 'The Passing' is set to be released in the coming weeks.

Announcement of the upcoming DLC titled 'The Passing'.

A new update for PC has been released, with a console version expected for Xbox 360 users soon.