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Don't you need to draw a vertical line of blocks from the top to the bottom of the stage?
Yeah I realized, but I think it's different for the sub area as well, though it's alright now, I found a good YouTube video explaining everything. It sucks though, really limits what you could make in the upper part as that has to be divided as well, or vice versa.
Do you not need to make a line on the top? I always just enclosed it fully.
If you want to take advantage of the upper part, I guess you could use a door. Underground areas in Mario traditionally are only one screen high, the exception to that is SMW where the underground areas are often pretty tall with lots of winding paths. Maybe the rules for that are different between SMW and SMB/SMB3?
Depends. If there are blocks above the first square grid, then yes fully, if not, the game ignores the upper half so until that point to be closed is fine.
I guess that's not too bad. You might waste a bit of space but with how big the levels can be who's ever gonna use all of it?
Well it's not only that. Imagine you're free form making your level and you come to a point where you think this part is good to block out; now if you want to create more areas above, you're limited by that wall that you made below as it goes all the way. That's the problem I'm facing atm. It would've been fine if Nintendo just made an option to select blocks to enable scroll stop or not.