There is a secret room on this map where you can place a rediculous amount of vendies in a really short period of time. @Kyle demonstrated how impossible it is for zombies to break and how easy it is to make and hold. I couldn't get a screenshot of the cade built right. Props are non-glitchable, so it makes it even more OP. If the Vendies were placed all the way up to the entrance, there would be no way zombies could ever enter.