@foone@digipres.club
The game uses the palette entries 0 and 143 to determine if it's going up or down. #143 pixels are going down, #0 are going up.
And both palette entries are set to pure black, so the fact that part of the screen is being used for algorithm storage isn't visible
@foone@digipres.club
it's at the top (left and right) and bottom because it was misplaced. The offset is wrong, so it loops around the segment (vertically), and it's placed too far to the right so it scrolls to the left side of the screen.