So that there are no intersections of objects or holes in the level.
To generate this level I used Houdini Engine. Plugin (HDA) runs perfectly on Unreal versions 4.19, 4.20, 4.21 4.22
*UE4 Level top view
*these combinations were automatically generated I just introduced some random parameters
*Follow me for updates on what I am creating: https://www.artstation.com/raducius