Draw Wall

In older versions this will allow you to trace a path that walls will appear down. Unfortunatly depending on the version the walls are likly to be bugged in some way or will crash the simulation. The two most recent versions will crash immediatly if these are used and earlier versions are buggy when using these.

The main problem with walls is that they're still "bots" in the sense that they share many simularities, but are designed not to die. These can bizarre reactions including ocasionally levitating and for one lucky wall, reproducition.