Hello guys :)
Today I would like to show a little research already been done in the past by an English hacker, still we don't know how he did it because it has not issued any tutorials relating to it.
The research involves an additional block tile to the two normal editable with advance map where we reconstruct the tile in the levels "above/below".
ASM ROUTINE - WIP THIRD LAYERS BLOCK v.1.0 - YouTube
hope you like it :)