Basically you have three types of layers for tiles:
- Blockable
- NonBlockable
- Objects
Blockable tiles would be walls and stuff
NonBlockable tiles would be ground tiles (Grass, water, dirt, etc.)
Objects are the chairs, tables, beds, etc.
How this works is you first select the tiles that would be blocking the player, like the walls, a house, fence, trees, etc... Then you add your next layer, grass, floor tiles, and so on. (You don't need to do this, you can switch back and forth between the three layer tabs) Then you add the objects.
Blockable appears over the nonblockable tiles, and the object tiles appear over everything.
As TBE suggested in my other thread that I briefly suggested this idea in, there would be a new level format. There should also be an easier way to add tiles to the tileset without replacing other ones.