Zipper Line?
The zipper line doesn’t always follow its own rules. For instance, In today’s adventure (glasses), the medium puzzle has two zipper lines. The first (2,1,3,2,1) made sense. The second one turned out to be (4,2,7,5,3). How do the sums of 4+2 and 3+5 equal 7? Is this a bug, or do I not understand how this variant works?