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Yajilin (Castle Wall) (1015)
Instruction:
Draw a single closed loop passing through some empty cells in the grid. The loop connects centers of adjacent cells, makes only right-angle turns or goes straight, and does not intersect or cross itself.
Some cells will remain empty; such cells are "unused" and cannot share an edge with each other.
The grid contains some outlined white, gray, and black cells that cannot be part of the loop. Outlined white cells must be inside the loop; black cells must be outside the loop. Gray cells can be inside or outside the loop.
Numbers and arrows in white or black cells refer to the total sum of the lengths of straight loop segments along the given direction. (An equivalent way to understand these values is by putting a dot each place the loop crosses a cell
border. Each numbered arrow then points to that number of dots.)
Numbered arrows in gray cells indicate the total number of unused cells along the direction of the arrow, starting in the arrowed cell and going along a row or column to the edge of the grid.