Creating a more expanded equivalent of something like Cloak of Darkness is something that does come up for discussion on here every so often. The last time was here, I think…
There are some very old 1970s/80s games (much smaller and more manageable than Colossal Caves) that have been ported so many times that they’re almost in the Cloak of Darkness realms but, of course, they’re mostly not “open source” like CoD.