This map is based on Resident Evil 5 mercenaries mode and it uses music from the game itself (owned by CAPCOM)
The map can be played as a classic L4D2 survival match or a custom mutation, which contains the real mercenaries mode with timer countdown and some new features.
Play it on local server only. I made a custom menu window to make it easier to find.
If you want to play via console:
The survivors boarded the plane, ready to go to a safe place, but in the middle
of the people on the plane were infected, the plane landed in a desert, the
survivors must go through the thick oasis and terror village, underground maze
dark, mysterious Research Institute, the final flight to escape