The Team Fortress 2 team has been helping the Left 4 Dead staff work on their multiplayer by incorporating many of the things they learned while developing TF2.

Some of the things improved/finished:

• Critical hits
  
• Respawn waves
  
• Auto-team balancing
  
• Facestabs
  

Well, it's been a couple of weeks since we updated the blog, and we thought it was time to let you know why we've been so quiet. The last couple of weeks we've actually been moonlighting on Left 4 Dead. While the L4D team has been focusing on finishing up the core cooperative gameplay, we've been helping them by working on their Versus mode. Versus is the recently-announced competitive mode where one team plays the Survivors and one team plays the Infected. We've learned a lot while working on TF2 in the last year, and we were able to apply some of those lessons to Versus mode. As a result, we've just finished adding critical hits, respawn waves, flawless auto-team balancing, and facestabs to L4D, while removing anything that looked remotely like a grenade.
I kid, I kid.

Deathsythe via teamfortress.com »