It just occurred to me that the graph-based interface from your Volcano Game could be a cool way to navigate "rooms" that were made up of source code files/sections to be "fallen through" as monster battles. So, you could work your way through a code base, retreating where necessary. :) (Maybe, as an educational possibility, even following program control flow? Getting flashbacks to 90s Cyber/Hacker movie VR now! :D )