A version was produced in 1982 for the ZX Spectrum, which seems to have been a straightforward port of the ZX81 version. There also appears to have been a different second 1982/1983 Spectrum version.
A Holdco advert from April 1982, as well as later months, also lists the game as being available for Atari and Apple II. The Hilderbay/Holdco arrangement doesn't seem to have lasted long so it's not known if these ports actually existed.
Jason Dyer covered the game as part of his All the Adventures project.
[+] Users who have solved this game
[+] Users currently playing this game
My word this is a frustrating game
There's probably a reason why the publisher is mostly known for business software :)
Good point. I'm not sure I can finish it!
I have solved it. I find it interesting that there seems to be no solution anywhere on the Internet. The game is tricky, but not really difficult - except for the fact that the only ZX81 tape image file in circulation has a deadly bug. The line 9310 LOAD in the BASIC listing should be instead 9310 SCROLL for the game to work. Once corrected, the game can be finished. I don't know if this bug was in the original game or is a side effect of the image conversion, but chances are it's the latter.