[FireHorse]

I seem to recall reading somewhere that the old Fighting Fantasy books were set to have exactly 400 "nodes" (using your term; they probably called them something else). I don't have any of them in front of me to check, though. In fact, I think the only ones I still have are The Warlock of Firetop Mountain and the 4-volume Sorcery! series (plus the Spellbook), and I'm not sure where those are all buried.