Choose one of the two rooms, and let's see if you lost or not. Good luck zombie hunter. Destroy all Power units to open the portal. Glue floor slows down all the players, but zombies walk fine through it. You have to wait until the portal opens, but the big danger boss will try to eat you earlier. Try to survive in a small room with hordes of zombies. Get to the portal without a gun, and only use bonuses to explode zombies. Here is a lot of work waiting for you. Find and repair four generators to open the portal.