“One 4 Nine” is a community created Left 4 Dead campaign made by Kevin “keved” Edwards.
It was originally released for Left 4 Dead in 2010, however it received a significant update in July this year. Since One 4 Nine’s initial release, it has been subject to critical acclaim, receiving a hefty 9.6/10 on ModDB and being elected as a “Featured Campaign” by Valve for it’s outstanding quality.