Slitherlink (Diagonal) (1178)

Draw a single, non-intersecting loop that only consists of line segments between the dots along the dashed lines, including diagonals inside cells. A number inside a cell indicates how many of the edges or diagonals of that cell are part of the loop. (Note that at most one diagonal may be used in each cell, as the loop is non-intersecting.)

Reference: WPF (1)