For the past few years the source mod No More Room In Hell has been in development. A few days ago a public beta was released of the game and from playing a bit of it with mooosicle, it's really cool.
The idea is a cooperative, objective based zombie survival game with 8 player coop. There's a mix between slow zombies, strong zombies, fast zombies, and more. There's a pretty heavy focus on the melee combat and it feels pretty nice. This isn't Left 4 Dead where the zombies are made out of paper, every zombie can be a threat. Gunplay is also very refined but ammo is limited and you can only hold so much. Survivors have a chance of getting infected by zombie bites and will slowly turn. When a survivor dies, they fall over and shortly after, get up as an AI zombie.
The only problem so far is, it's REALLY hard with only 2 people and who wants to play with pubbies when we have a perfectly good community of zombie haters right here!
The call has been made, Goodjers. Download, install, fight!
Starter guide (with install instructions): http://www.nomoreroominhell.com/nmri...
No More Room in Hell uses an Objective Branching system which allows the map to randomly decide which objective the survivors must complete before they move on into the next area. This means that in every new round, the tasks that the survivors must accomplish may change, so they have to be vigilant and cautious. The ultimate goal is to reach the extraction zone before time runs out. Generally, Objective maps range from small and linear maps, to large and complex maps.
Infection is a slow death process that you can get if you're swiped enough at or bitten by various zombies. If you're infected, your vision starts to blur out and your breathing gets frantic. Eventually when you die, you will fall down to the ground dead and after a predetermined time, you will reanimate as a member of the undead. You can temporarily stop the infection though, if you use the pills item. Pills are represented as a small pill bottle item. They won't last long however, so you have to make the best of your life before you succumb to your death!