Spacial Harvest by Kevin Macleod
The Black Walls separate The Maze into two sections, the entrance and the Cavecrawler Cavern. At any given time, one of the seven Black Walls is open, allowing access to Cavecrawler Cavern. Every 3 to 5 days, the open Black Wall will close, and another in a different area of The Maze will open up, changing the path to get to the cavern. These walls are unable to be blown up or removed in any way. It is believed that if someone removes one of the black walls via hacking, there will be no trees in the Cavecrawler Cavern, though this has been tested and proven false.
If an exploited map or video tutorial of the path to Cavecrawler Cavern is leaked, then Defaultio will close all seven walls to the Cavern or block the entry to the cavern with a stone wall, prohibiting access.