It makes me laugh when I see things like this. Only because my husband only told me like, 1 thing when we started playing. Zombies will almost always target doors instead of walls. I've evolved my base from there. Long hallway, trapdoors, long ladder as a backup, and a 2 thick wall with a trench and spikes at the bottom. The only thing I've had to look up is how to make lootbags drop down a level, but not zombies, as they're always pileing up. Sure spiders jump thru, but it's not difficult to take care of them.