Hellfire plot structure

My dissertation contained a section dealing with the theoretical mapping of interactive plot structures. I decided to have a go for real, and this image (click to enlarge) is the result.
I spent a while playing Hellfire (an online gamebook), from the Fighting Fantasy Project, and mapped out all of my attempts. The squares are interactive points (including their "page" numbers), the arrows are the flow of events, the circles are possible endings (all deaths) and the blank squares are options that I didn't choose.
By the way, the Fighting Fantasy Project website is pretty fun. I recommend stopping by if you are/were into gamebooks. Or if you're gamebook-curious. Or if you've got some time to kill (let's face it, you do).