Use the WIRE ROPE on the well and drop down to the floor below. You're now in
the central area that you couldn't access before this. Take the [SOLAR SWORD]
Level 16 and equip it. You can simply drop the Wooden Stick on the floor as you
won't need this now, and equip the new sword. Return up the wire rope (and pick
it up again: don't leave it in place) and head all the way to the top left
corner of the room to find the [KEY]. Go back to the right side of the room and
use the KEY to open the door on the lower wall. Walk left and up the stairs to
the next
floor.