Yeah its like the side scrolling games. While going side to side the far end "right" and far end "left" gets clipped to load in the design (I think i said that right) Its like making a triangle cutout on a cardboard paper then putting it over a passage on a book. as you are going left to right letters get clipped while from the left and loading new letters from the right and vise verse.
See its easier to visualize it on side scrollers games while I see things like zelda who uses over head but is always loading per box. That per box thing can get annoying at times, reason I said it should be a mix of scrolling bigger areas and loading block to block depending on the feel of the creator.
I know "Mother"
(Mother's Map)does this with the over world. though its more over head scrolling and the only time it loads is when you go in a building or cave but how do you determine the size of something like that?
so back to the image (i know I have to make my edits

) if I wanted this large area for the player to walk through without moving block to block just to get your scenery all cut out (yuck)
and have the player move freely like this without loading until he goes into the cave or the bottom area to the new zone, but also keeping it where you fall under the BG palette groups.
How do you know when too big is too big? I just may be overly thinking things. I must be annoying by now so I just want to apologize on my noobness .
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Soon to be redone and fixed so it doesnt look so "tile-ish". I have to rethink this whole thing now with the whole grouping area for a darn palette(s).
If I recall, Shiru's BMP import will take the first 4 colours found (i.e. scanning left to right, top to bottom) and treat those as color 0,1,2,3 in the imported tile. I think I worked around this by placing 4 dots in the corner just to keep it from re-ordering the colours on me.
How so? I put the transparent - 3colors, transparent - 3colors, transparent - 3colors, transparent - 3colors,
but for some palette 0, 1, and 3 works. I tested 2 but its not changing anything.