Mid-Loop is a logic puzzle published by Nikoli. A rectangular or square grid contains dots; a dot can be situated in the center of a cell or on a border between neighbouring cells. The aim is to draw a single continuous non-intersecting loop that properly passes through all dots. Dots must be traveled straight through. Segments of a straight line going out of a dot must be equal.
Cross+A can solve puzzles from 3 x 3 to 30 x 30.