But 2D sidescrollers have traditionally just "paned" the already drawn/rendered (buffer?) and only redraws the new bits. In some cases this caused artifacts to

But 2D sidescrollers have traditionally just "paned" the already drawn/rendered (buffer?) and only redraws the new bits. In some cases this caused artifacts to stick to the screen. Specifically thos was not unheard of regarding games made with KnP, TGF and MMF. I guess this was before HWA, though.