In this map you will have to be extremely cautious and make fast decisions that can mean the difference between life and death. (In other words this map is hard.)
There are 9 intense waves of zombies that you will have to kill in order to succeed.
Each wave has a Guard zombie which drops a key when killed.
Use the key to start the next wave.
There is also a shop where you can spend the points you get from killing the zombies.
If you want more pics click here to see the full imgur album: ALBUM
Everything else that you need to know can be found in the map. :)