Welp, I'm stuck. I've visited all but three rooms (a1, a2, c3) on the top three ranks (and none on the bottom two), but to be honest, I'm not even sure I understand what opens the doors--I would have thought "red boxes on the ovals with dots" would be it, but in the entrance, one is enough, unless the statue is in the wrong place, in which case...
I'm liking it, but I feel like I don't have enough information to move forward.