I'm currently mapping the things people told me to do in the comments. But due to a friend who showed me a wonderfull prank on my PC, I had to reinstall Windows again...I saved the files with Linux and now I'm installing all the programs and that stuff. So it may take some more time, but I WILL update that map.
This is an survival map for Left 4 Dead 2, which was made of an MiP from jiimbob. It was meant for Left 4 Dead but I worked and ported it into Left 4 Dead 2. You have to survive in a base as long as you can. You have infinite time to prepare. But once you started the generator, the base becomes bright and the battle begins!
More Informations are in the readme file.