Overlapping Tiles

[MMOGuy]

So when i lay down  a image in the level designer  some images  are pure black and overlap the layout and make it look  disgusting how can i make the map blend together  with the default assets and make it look nicer?

[jcsnider]

Clicking on the icons in red will let you place your tiles on higher leveled layers making them overlap instead of replacing each other:

[Apache_]

The mapping intro help file is pretty good. Hopefully the rest will come shortly after B6.