Valve is offering early access to the Dead Air piece of the upcoming Cold Stream DLC, if 20,000 willing guinea pigs unlock an achievement by the end of day on Sunday.
"Yup saw both of those issues too.
My team of 4 friends couldn't actually finish it, it was ..."
The beta for 'Cold Stream,' part of an upcoming Left 4 Dead 2 DLC pack, is released via Steam.
"Oh right, most of you guys haven't experienced what it's like to use Beta software. :V"