A number of weeks ago I posted regarding my intention to run Stygian Library solo. There's a link right here but for some reason they aren't showing up as such, so please scroll to the end to read the comprehensive list of pages linked in this post. I've since already run a party of adventurers through a delve in the Stygian library, and had some thoughts about what the survivors (spoiler alert! some of them survive!) do next. However, before writing that up I wanted to go into a little more detail about how I'm using BLUEHOLME as the "operating system" (OS, Really) for Stygian.
The 1977 Dungeons and Dragons "basic set" by Eric Holmes, aka. the Holmes Basic can be thought of as the "missing link" between OD&D and B/X (or perhaps even B/X and AD&D 1e), and it is not without its fans (particularly popular blog The Zenopus Archives). Blueholme is a retroclone of that ruleset by Michael Thomas, and seems to have emerged following conversations on the Dragonsfoot forum.