Legacy
World 2
Tower Level 3
It is highly recommended to use a written map on Tower Level 3.
You need to find 2 normal buttons/levers, activate them and go to the West side: a wall disappears, a door appears (the only door on this level).
You must find only 2 levers which moving 2 walls on the west side. Just go around, and try to bypass the "floor canals".