What changed in Left 4 Dead in 2010

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

Added a glow to the Witch for the Infected team.

Added a glow to the Witch for the Infected team.

Quicker spawns for the infected in Realism Versus mode.

Coop mutation featuring Gib Fest with M60s and buckets of blood.

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

Co-op mutation featuring M60s and buckets of blood.

Quicker spawns for the infected in Realism Versus mode.

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

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

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

Halloween costumes for characters were showcased, with a poll on favorite costumes.

Halloween costumes for characters like Hunters, Zoeys, Bills, and Rochelles are featured.

Players can vote for next week's mutation from a list of options.

Players encouraged to dress up as characters from Left 4 Dead and participate in a costume poll.

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

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

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.

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

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

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

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

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

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 cross-platform ownership through Steam Play.

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

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.

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

The Mac versions will receive updates in sync with the Windows versions.

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

Both Left 4 Dead 1 and 2 will be released on the OSX operating system for Mac computers.