This isn't really a work of fiction as much as it is a grab bag of riddles, at least 30, mostly built on wordplay. You type a number to go to that riddle and try to solve it, if you do you get that keyword (the answer to the riddle) in your magic book. When you decide to fight the final boss you use the words in your book to attack and defend. Sometimes your companion will prompt you to use a certain kind of word (repeated letters, alternating consonants and vowels, pronounced two different ways). Once a word is used it disappears from your book and you can't use it again.
The boss fight was the fun part, the individual riddles were the hard part. Perhaps that is an indictment of me and my poor wordplay skills, but I think I only got about 15 or so on my own, then used the walkthrough to get 5 more before getting tired and frustrated and skipping to the boss fight. Some of the solutions to the riddles seem unfair to me, as in I can't imagine how I would have ever gotten there without the hints. Others are fairly easy, but fun, and some are clever and satisfying. In the end though, it didn't really grab me and hold my attention. Your mileage may vary.