规则Rules：
标准数独基础上，每一条“拉链线”上，与中点距离相同的两格（例如每条线的两端），它们的和等于中点格的数字。此外，为了便于观察，每条线的中点都已经用圆圈进行了标记。
Classic rules applied. Additionally, pairs of digits that are an equal distance from the centre of each 'Zipper Line' (for example, the two ends on a line) , must sum to that digit in the centre of that line. For convenience the central digit of each line has been highlighted with a dot.
