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.
Just AWFUL! Honestly, when I played it, it was the same thing over and over. Get to the humans, die, get to the humans, die over and over. And the human gameplay isn't that fun either. I was expecting something so much better.