L4D2 Celebrate The Passing With Valve On April 22

The DLC is free for all you lucky PC users and 560 Microsoft Points for the Xbox 360 crowd (grrrr).

In celebration of the “The Passing,” you’ll have the opportunity to compete or play with Valve employees on Thursday, April 22, 2010. For the PC, go online between 11 am and 5 pm PDT and friend one of the following accounts:

For Xbox 360 users, sign on between 7 pm and 11 pm PDT and add one of the following to your friend’s list:

Oh and if you’re a PS3 fanboy and you happen to link up with Gabe Newell, please be nice.

“The Passing” shuffles its way onto both the PC and Xbox 360 on April 22, 2010.

Source:  Left 4 Dead Blog