How do you make invisible bricks?

[ryos]

It's not that the bricks are invisible, it's just that they're being covered up by tiles placed in layer five or six. I don't think, however, that there is a solid black tile to use, in which case Brell used a custom tile in TPI. If your rooms have backgrounds, though, then you can just use whatever background tile you were drawing with.

You also probably will have to erase the fringe. This is the 3D effect placed automatically by the editor in layers 1-3. To erase it, switch to those layers and click away.

Hope that helps.