I played this game yesterday with my friend, and we "found out" that the players can hit trough the walls at the base. This isn't gamebreaking, but we could easily defeat several hordes with just standing by the wall and constantly hitting the melee button without wasting ammo and without losing lifepoints. Also, some Zombies came trough the wall without destroying it.
Like I said, this isn't gamebreaking, but it makes the game just a lot easier than it should be.
(sorry for my bad english)
Also, I just wanted to say that I am really happy about how you take care of the game and the community.
Thx a lot^^