I've seen something like this in TSRPX world map so I decided to make something based on it. I still need to fix the outline of the star road tiles but it's just a detail.
Can't be used with SMB3 tiles. At least not with grass ones.
This is pretty nice considering Bowser's Valley tileset and the normal grasslands/mountain tileset cannot co-exist in the samp map section. This is definitely quite useful.