Many, many, many years ago, I obtained a C64 emulator (I think it was C64S) with a number of bundled games, including something that referred to itself as The Hitchhiker's Guide to the Galaxy. I did not end up playing it very much, as it was a horribly sparse and limited game – probably cobbled together in BASIC – and seemed to bear little resemblance to what I could find described in some UHS files I had come across.
It was only recently that I came across a reference suggesting that this was a known "bootleg" version, but Googling fails to turn up any references as to who knows about this game or how it might have originated. Perhaps I am Googling for the wrong terms?