Also available in Japanese.
John Aycock and Katie Biittner's 2020 paper Inspecting the Foundation of Mystery House takes apart the game and analyses it in detail. John has supporting material, such as a detailed output of the game's code, on a linked GitHub page.
In 2023, Christopher Drum produced an unofficial version of the game, rebuilt for the Pico-8 platform. See here for the game and here for the source code.
[+] Users who have solved this game
[+] Users currently playing this game
Historically significant for the graphics, but graphics are designed to be more than dressing: they replace text, and this was not to everybody's liking. Too many times the player does not know what an object is and what word to use, and the parser's awfulness does not help. This, plus the thin plot, the instant deaths, and the annoying forest maze, makes for low playability, but there is something in the whole concept that makes the game special. Might be the Williams' secret sauce.