My pleasure. : )
Because this is an unmapped area, I just took a screenshot about this 4 level pyramid in the editor, probably it helps to other people too.
!!! SPOILERS AHEAD !!!

The red arrow represents your starting point. When you fall down through holes you'll be directed to the bottom-left (then to the bottom-right, largest) area. While when you climb up you'll be on the top-right (smallest) area.
The secret buttons are on the bottom-left level - one in the northern and one in the southern part of this section.