I've been an Emacs user for 20+ years and had never stumbled across that game, thanks for highlighting it!
I found the CPU, the Key (guarded by the bear) and made it into the house. Was a fun diversion I guess I need to play it more seriously sometime.
Dunnet was originally written by Ron Schnell in 1982, as a Maclisp program running under TOPS-20. [1] In 1992, he ported it to Emacs Lisp; however, the Emacs Lisp version is more than just a simple port of the original, it extends the game with new rooms/items/puzzles, but also removes MIT-centric content–e.g. the "endgame" computer at the end of the game was originally named MIT-SALLY, was located at MIT, and was accessed via Chaosnet–the GNU Emacs version removes all those (dated) MIT references–although the GNU Emacs version contains (obviously intentionally) equally dated (albeit more widely recognisable) content such as a VAX 11/780
[0] https://en.wikipedia.org/wiki/Dunnet_(video_game)
[1] Original is here: https://github.com/Quogic/DunnetPredecessor/blob/master/foo....