My obsessed-with-VV3 friend has something to say.
Here we goooo:

Ok, well i juss dont get it, eyeshigh said the staircase near the gong enclosure, but i went on the game and i put a girl there, she even stay there, i dont think they would have made vv3 by that if they cant go, but in vv1-2 they could go in the cave to see. Well anyways, maybe one day the villies checked out the enclosures teeth, it had marks, and that could show them where to go, they would have to decode or something. Anyway its juss a guess,

She made many spelling errors.. <.<