So, it is effectively a shadow sprite?
Not quite shadows. It's for rendering a 1 pixel outline surrounding the tiles. They need to be rendered before the real tiles.
These probably should be explained in a help tab within the program.
Yeah. I did briefly go into the outline modes in the instructions, but it's a complicated topic which would need a more in-depth explanation.
I updated the tutorial and added some illustrations. I hope this clears it up.
Thanks. Yes, it does.
