Skipping taking snapshots of the first basement floor since the path through there is actually pretty straightforward - the second basement floor, on the other hand, has something important for us... and it's right there.

We have to go down to the fourth basement and come back through another way before we can get that treasure chest, but once we've got that, we'll basically have free-run of the place (provided we don't go too deep - we haven't seen the new monsters yet, and they'd definitely slaughter us at our level).