[mikepg]

this has been posted about 50 billion times, but...
it wouldn't necessarily make level files 4 times the size.

if you wrote out all the tiles in code, just like normal .graal files are, and then used arrays at the end of the code, that would represent coordinates...like this:

tilesup = {(0,0),(2,12),(3,4),...,(n,n)}
tielsdown = {(0,1),...,(n,n)}

and you get the idea.
that would only be about...5500 more bytes (5.5kb).