The End of Books (1992)
nytimes.com
nytimes.com
I'm not sure hypertext has really found its fictional style. For the most part, I'm not sure anyone is even really still trying. It'd be nice to know about anyone who is.
[1] http://paranoia.allenvarney.com/
[2] https://en.wikipedia.org/wiki/Lexicon_%28game%29
[3] https://en.wikipedia.org/wiki/Paranoia_%28role-playing_game%...
Microscope: https://rpggeek.com/rpgitem/93970/microscope
If you haven't heard of this one, it has a similar concept, but you're not defining encyclopedia entries. You're laying out the history in chronological order and introducing events along the way to fill it in.
EDIT: You don't lay it out chronologically. You specify a start and end (rise of the new king and start of an empire, fall of the empire), then fill in the gaps. The effect is that there's a chronology of the world laid out for you to observe and build on. My original comment wasn't clear on this.
Some of her works are more what I'd think of as "interactive fiction" as opposed to "games", although they certainly serve to blur the line between the two genres.
https://en.wikipedia.org/wiki/Porpentine_(game_designer)
I am particularly a fan of "Ultra Business Tycoon II": http://aliendovecote.com/uploads/twine/tycoon/crime.html