The 1986 date, originally listed here, is incorrect. The program itself states a copyright date of January 1994.
The C64 version was adapted in 2020 to make an unofficial version for Plus 4; see here.
[+] Users who have solved this game
[+] Users currently playing this game
Delightful little game, an entertaining half hour. Very simple, only one object caused problems, I hadn't paid attention to the room description.