Zombie Panic! Source is a standalone cooperative, survival-horror, first-person-shooter! Set in the middle of a zombie apocalypse, players start as a small group of survivors attempting to stay alive. Each map will have its own objectives to complete and win the round or survive by a period of time.
The Official Zombie Panic Theme Song. First created for HL:Zombie Panic and completely updated for Zombie Panic: Source.
Yes! Finally I found it :D