Here is an image with a bit more going on like Bonn-o-Tron.
Just finished programming and debugging terrain elevation changes.
I still have the default terrain set to gray
So you see a road surface, sidewalk, grass, dirt, and just a little sand.
You click on a space and the ground goes up 1 plate (3").
Hold CTRL and click, it goes down.
UI needs work to make it easier to use.