It’s meant to be played on graph paper. The general idea is a randomly generated dungeon crawl. When you get to a door, you roll 1d6 and draw the next room! Each M is a monster, and each L is loot, which also has random tables to determine what is what, or you could use random tables from any other system with the general idea.
That looks great! I’ve always wanted to do something similar, but the conflicting backtracks would be some sort of weird non-euclidian space. But mapping that would be hard.
I would have Daggerfall flashbacks if I tried to map that 😅
You could do that as an alternative to finding stairs down - instead you find a gentle slope that goes under the previous tunnels, then start a new floor.