Really fun, quick read.
It also reminded me that even 80s geeks can have wildly different expertise in different sub-genres...
One of the first puzzles to get solved was something about Dungeons and Dragons that felt so esoteric to me that I almost lost interest in the book, thinking “These are not the 1980s references you were looking for.”
Later, I was rewarded with a clue that should have been so obvious to anyone who played text adventures. But, bafflingly, the clue was so challenging to the general population of players in the book that this puzzle went unsolved by any character for a significant length of time in the book.