In a world based on Douglas Adams' classic novel your challenge is to collect five artefacts and take them to the public bar.
Released "by kind permission of Douglas Adams and Pan Books", as author Bob Chappell had sought and obtained permission from the publisher Pan Books for the original PET version of his game.
After the release of the adventure for other platforms, when Adams was working on his own computer game, legal action was threatened and the Supersoft title was withdrawn from sale, only to return as the legal friendly Cosmic Capers. (For comparison, see another of Bob Chappell's games - The Cracks of Doom.)
See the excellent Digital Antiquarian article for more details.
Supersoft published the game on the PET and C64. Estuary produced the Spectrum port and also an Apple II disk version. An Oric 48K version is listed as "coming soon" in various ESP (Estuary) adverts.
Also available in German.
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Seeing how awful this game was, I'm impressed that anyone felt the need to remake it.
The "Good Old Days" link seems to be for the Infocom game, not this one.
Right you are - fixed