Overlays showing the invisible camera movement activation lines in Super Mario Bros. and Super Mario World.
Left: in Super Mario Bros., the camera only moves to the right. As such, if Mario is to the left of the left line, the camera does not move. When he touches the left line, it begins to move but does not match his speed, increasing in speed the closer he is to the right line. Finally, when he touches the right line, the camera matches his speed, preventing him from ever getting further than that point on the screen as long as there is still space for the camera to keep scrolling to the right.
Right: in Super Mario World, the concept is elaborated on in horizontal levels and made double-sided to accommodate both left and right scrolling. Whenever Mario touches a dashed line, the camera moves to align him with the solid line with the same-direction flag (the left solid line when moving right, and vice versa), and keeps up with him as long as he keeps moving.
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