Zork
The Zork gamebooks were about 120 pages each and had only ten puzzles. Like the game it kept score although unlike the game you got only one point for each puzzle. Most of the time at the story's end you got another try, except in certain amusing situations. I'll provide a link later because it's a bit of a spoiler. The pattern was very linear(in fact, you almost exclusively moved forward in pages through the book) and it was almost like a story-book in that regard. The books were written in the third person, as you make the choices for two likable youngsters named Bill and June, who become Bivotar and Juranda when they enter Zork and are guided by King("Uncle") Syovar. The books had much of Zork's humor(the cover page was especially catchy, being an early start to the gamebook!) although they couldn't really capture the intricacies of the puzzles.
Indeed, whenever they tried to be non-linear, they usually admitted inconsistencies. However, running jokes like a cheater trap in each book, along with characters that reappeared, made these books very likable. Oh yeah. Did I mention what a sucker I was and still am for books where characters find a door to a new world a la Narnia? Sadly, haven't found any good ones lately.
However, they were generally a neat way to control two characters, and the books were fair to each--each made silly suggestions as well as good ones. The pictures were nice line drawings, and the endings were frequently amusing.
As a side note I must be honest when I admit the only reason I got up to 160 out of 400 points on Zork II is because of the books.
There were four Zork gamebooks all told. They are(links with asterisks don't work):
Here's a grid of ratings for the books.
This site made me think about putting the other books into hypertext(pending ActiVision's blessing, of course) so that may be coming soon. It would be a fun project.
Eventually I'll make a list of which puzzles in the book correspond to which game puzzles. In the meantime, here is a brief survey about something not terribly important that's been bugging me(I can't update results constantly yet. I'm still working on CGI, and I can't quite figure out how to use check-boxes yet):
How do you pronounce Bivotar?
So far, 
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