Why not just write up a routine to scan the vertical column of map data and write a fully furnished/finished hellevator over it? Directly writing tile data is really simple once you actually know what you're looking out for (both to do, and what to avoid doing). Plus the finished thing would be real fancy looking, too. (Would probably be best suited in the world file, or global, if there is a global... but that's more for like, library files or subroutines.) And I guess if you wanted it to be really clever, you could configure it to take a pre-built pattern a player would lay out on the surface, and just continue that pattern down to a given/desired depth. :u