First of all, the game is tangential to both the book and the radio show, as well as the TV series - every single HHGTTG series has been separate, and only somewhat related in the general eventline.
Secondly, nothing was based on the game. The book and TV series were both based on the same story which evolved in Adams' mind from the radio show.
The text adventure doesn't go on long enough to fork from the basic storyline, in any case, though it more closely follows the book and TV series (character-wise) than the others in terms of who says what (for example, in the radio show, it's Arthur who negotiates with Prosser at the beginning, not Ford).
The book and TV series do form a pretty close timeline, though they still diverge in a number of places, and of course, the TV series ends just before the end of the second book. The text adventure was originally going to continue on (yes, I've beaten it, yes, it's a major pain in the ass, and I was stuck on the last step for literally a decade - I first almost beat it when I was 9, and it wasn't until I was 19 that I finally caved in and read a hint book to find out about the stupid very-deeply-buried wordplay which leads to the final three moves of the game) but I'm guessing that since not enough people managed to beat the first one, they didn't bother continuing it.
Oh, and the game ends where Eddie finally opens up the Heart of Gold on Magrathea. Don't expect to find out the meaning of life by playing it (it doesn't even get to any mention of 42).
More book history: The first two books (HHGTTG and Restaurant at the End of the Universe) are pretty much the same in all three series (radio, book, and TV). The TV series (again) ends at that point, while the radio series and book series completely diverged at that point - the second season of the radio show bears no resemblance to the final three books. Another interesting tidbit is that the third book ("Life, the Universe, and Everything") was actually a rewrite of a series of Dr. Who episodes which Adams wrote but were never produced, having been superceded by the multi-writer "Key of Time" storyline (not that it would have been at all strange for Dr. Who to repeat that storyline, considering that every other major storyline was done at least 4 times, but I digress). That's why book 3 was stylistically different from the first two books, and had the whole "quest" stuff.
BTW, if you haven't read book 5 ("Mostly Harmless"), don't bother. It spends most of the time doing a really bad job talking about branching-universe theory, and ends very half-assedly in a way where Adams practically screams, "I'm sick of this series, so stop asking me to write sequels." I think he wrote it specifically to piss people off so they wouldn't ask for more sequels (not that there could feasibly be, with the way it ends), and it's definitely not Adams' best work. Unless you want to feel angry, cheated, and pissed off, don't even touch it with a ten-foot pole. Really, it's that bad. I'd rather read 3001 and the last half of the Rama series again than even think about picking up Mostly Harmless. Blech.
"Is not a quine" is not a quine.
I have a master's degree in science!
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