Every slider must have a clear and visible path to follow from start to end. Sliders which overlap themselves in a way that makes any section unreadable or ambiguous (including "burai sliders") cannot be used. This is so that no slider has an appearance that is confusing or impossible for the player to read. Additionally, the slider borders must never be covered up from the slider being packed in too tightly. However, sliders that cross over themselves are fine as long as the borders are clearly visible.