Arnheim has long been the site of strange happenings and stranger rumours. The people are usually friendly, but they have an odd habit of looking over their shoulders, especially after dark.
The authorship of this program is unclear and it appears it may not have been authored by Dian Crayne after all. The opening sequence claims the program and script were developed by Charles A. Crayne.
This game can be downloaded via a .zip file from the late Charles Crayne's website.
[+] Users currently playing this game
I stumbled across this game on Charles A. Crayne's old web site at web.archive.org/web/20090217124344/http://www.pacificsites.com/~ccrayne/charles.html.
The file name is monster.zip.
It seems to have been written solely (or at least partly) by himself.
There is a manual included which he penned on 22nd June 2006, that is 23 years after the original game was written.
The game is the longest of all the series (exactly 258 rooms) but too buggy for comfort, which results in a below-5 rating for me. It *can* be completed, but it is touchy. Plenty of puzzles, mazes, and treasures to gather, but the only known implementation at this time is a beta version, and it shows. It is not particularly difficult in terms of problems, though the random quirks can tax the player's patience.
I uploaded the map of Monster Rally and the game many months ago. It is still queued together with a veritable caravanserai of other files.