To continue with another idea (space bar was the first), what you guys think into putting room on the left side, those you can click on, in a different background color for those that are linked together?
Let say you need lupine lair prior to have the spider so you could see that, for example, the lupine lair would have a red background color and the spider room too. This way you see its a kind of "upgrade" from the lupine room.
Same could be said about skeletons, lets say in white? and so on.
I got the werewolf room, but I don't know from which one it come from, lupine I suppose...
What you guys think about this one?