In Mode 1, which seems to be what is most commonly used, you get the 2bpp BG3 layer.
According to the Background Priority Chart here it can either go on top of both BG1 and BG2 or underneath them.
In Yoshi's Island there are tons of places where BG3 is in between BG1 and BG2 which is not listed in that Priority chart. At first I thought, well, that has the SFX2 chip, maybe they got some extra shit in there for better BG prios.
But in stage 1-2 of Hagane, which to my knowledge has no extra chips, the BG3 is also in between BG1 and BG2.
Is there some mistake in that documentation, or am I missing something?
According to the Background Priority Chart here it can either go on top of both BG1 and BG2 or underneath them.
In Yoshi's Island there are tons of places where BG3 is in between BG1 and BG2 which is not listed in that Priority chart. At first I thought, well, that has the SFX2 chip, maybe they got some extra shit in there for better BG prios.
But in stage 1-2 of Hagane, which to my knowledge has no extra chips, the BG3 is also in between BG1 and BG2.
Is there some mistake in that documentation, or am I missing something?