Fortunately you found some lost equipment near a mysterious base.
Now you try to use everything you can find to build your way out of that lost place!

Reloaded:
-Nicer Map
-Hint System
-Better placed Barricades
-Much better Zombie / Specials balance
-Structures before build are now unsolid
-many small changes and fixes

It seems I need to add some further instructions: 
On the Techtree after you unlocked stuff you can take it by using the unlocked square again. You can take it as often you want and much faster then the unlocking process takes. 
There is 2 kind of breaks you get: 1 break after the Tank spawns (like 70seconds) and another break when you use the "gas-controller" (useable after a cooldown when the lights turn green) 
It starts a fiery ring that burns most of the incoming zombies for like 45 seconds. 
I recommend unlocking smg and pipebombs first, then pills+maybe melee and then whatever you like and start to build stuff. As first barricades I recommend the sentry gun (for faster Tank killing) and the 2 burning barricades and then whatever you like and seems rational. 

Recommended for 3 or 4 Players.
The map is not meant to be played alone. In the Campain modus I spawn all the zombies+specials manually and after many tests it is now optimized for 3 or 4 players.
The difficulty changes a lot with human players because they are able to build and take guns+pills+medipacks what bots cant do.

Known Issues: 
-Desert Rifle does not work on the techtree 
-Special Infected sometimes get stuck before Barricades