Slitherlink (Wolves and Sheep) (566)

Other names: Wolves and Sheep Fences

Draw a single, non-intersecting loop that only consists of horizontal and vertical line segments between the dots. A number inside a cell indicates how many of the edges of that cell are part of the loop. Cells containing a wolf must be outside the loop; cells containing a sheep must be inside the loop.

Reference: WPF (1)