1: Editing a billboard block:
Each block represents a stretch of road, and describes different aspects of the layout. Billboard blocks define the non-interactive scenery at the side of the (or indeed in the) road.
Lots of randomness is involved here, which makes our lives easier.
2: Placing down coins along the road:
Some columns, instead of being data blocks, can contain individually placed items. Here we are laying out coins to pick up. These are dragged around and placed in the 2d editor for ease of use, but are updated real time in the 3d view.
3: Selecting a set of billboards to use for a block:
We pre-define objects which can be used in the levels. With billboard blocks we can select individual items, or groups of related items. (eg. Group_rock_walls).
The billboard block can then specify whether these are randomly selected, sequentially, or anything else we can think of.