Excuse my impatience - I could quickly test this when I get home.
When there are 9 sprites on the same line, which sprite is not drawn? Is it the one with the highest OAM address? Or is it the one with the highest X coordinate?
When there are 9 sprites on the same line, which sprite is not drawn? Is it the one with the highest OAM address? Or is it the one with the highest X coordinate?