I'm stuck in the third dungeon, with the hint "Where arrows fly when fired thrice, look between the rightmost eyes." I've checked in every room where arrow traps are, and I don't see "eyes" anywhere.
It's a tricky one! The "eyes" are the holes in the wall the arrows are fired from, so look for the room with three arrows to dodge and try some way of getting through the wall between the rightmost traps...