I bought Inaria and I'm apparently not very good at it. I cleared out the first 3 dungeon maps but The Cube vexes me. I spent a good half hour in there trying to find out if it was the underwater passage that the villagers mentioned, but I think it only has one entrance and doesn't go anywhere. I am rubbish at puzzles though so it might be connected somehow.
Could someone give me a push in the right direction?