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.

HLRaven says

10/10 - Agree Disagree

Awesome mod. this is one of the mods i used to play back then. its good and nostalgic for me. and now they are making a new update! 3.0 Cant ******* wait!

The only issue i have is that sometimes there are dickheads who steal all of the ammo and dont share. or break the barricade so survivors can't win. but that happens VERY. rarely. but this aint really a issue. its a issue with the community.