Well, it's something I did when I was young. Worldbuilding to the nth degree and slavishly studying AD&D manuals of various sorts. Would like to do it again, one day, I guess.

I was interested in seeing if anyone here had any experience of it as I'm sure plenty of writers on here have a history with tabletop gaming of
some description or another, and have therefore some level of interest in the creation aspect of said games.