GameTavern - Zombie Panic! Source

Zombie Panic is a [free] third party mod for Source (Half-Life 2). It's a lot of fun, you have a group of humans aka survivors pitted against zombies. All the players are controlled by humans, no bots or anything. The game starts out with a lot of survivors but as they get picked off they become zombies. The survivors can pick up various weapons and try to hold down fort. It's incredibly unbalanced for the humans, and I have yet to play a round where humans win. Also, the game is very buggy. But it's also tons of fun, a microphone is a must. Everyone gets together and there's some pretty kick ass teamwork involved. The level design is really good minus the poor mapping and the glitchy gameplay. All in all this is a ton zombie-mod and if anyone has Steam they should check it out.