After following the trail of liquid...

[Viking]

I got stuck. How bad is that?

I did figure it out eventually (that'll teach me for saving the oil in my lamp and miss seeing the obvious in there) but I just wanted to say how much fun I had spending a good half hour piling up boxes from the different rooms trying to climb up through the large hole in one of the ceilings of the rooms.
Almost got up there as well but those tiny boxes kept teetering over.