I have played through this one many more times over the last few days, in the process of mapping it all out for the website. As with the first two, Joe and Gary managed to put a lot of complexity into this book.
There are four distinct entrances to the Cavern. The glacier path really is more dangerous, but may give more loot. There are at least four places to pick up a blue triangle keycard, some of which don’t involve a kolkath. And the quickest path to the Vonotar means missing almost half of what’s there, there are so many paths that work.
It’s all basically one castle and some ice, and not an epic quest like Fire and Flight were, but once I dedicated myself to playing more combinations to get it mapped out, I am quite impressed with the scope of what is in here.