How do I use this?
If you are lacking in rulebooks and/or friends this is pretty much useless.
Only post singularity. Much of the appeal of roleplaying games is being able to do stuff that you can't do in video games. But a sibling comment did link to a tool that would let you play these maps with your friends by importing them into a virtual tabletop.
I've actually used this in the past for a randum dungeon in my lockdown RPG campaign. It's pretty awesome.