Valve og Turtle Rock Studios er kommet med en ny opdatering til first person shooter spillet PC Left 4 Dead 2.

Spillet Left 4 Dead 2 blev frigivet til PC og Xbox 360 i Europa den 20. oktober 2009.

Changes:
- Next Mutation: Flu Season
- Removed a demo ConVar that was being used for an exploit

Dead Center 1:
- The lower windows should no longer be accessible (versus map grief).

Dark Carnival 3:
- Adjusted brush that was blocking a truck interior, to no longer block the truck interior.
- Adjusted the rollercoaster event start to make it more difficult to skip.

Hard Rain 2:
- Adjusted blockers on the pipe-hop shortcut to provide better coverage.

Hard Rain 1/5:
- Adjusted blockers to better cover the added box which itself covers an invincible spot.

The Passing 1:
- Added blockers for survivors along the railings in the upper areas to prevent them from leaving the map or getting stuck out of bounds