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Yajilin (Diagonal Clues) (1175)
Instruction:
Draw a single closed loop that passes orthogonally through centers of some empty cells in the grid. The loop connects centers of orthogonally 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 gray cells that cannot be part of the loop. Numbered arrows in such cells indicate the total number of unused cells along the direction of the arrow, between the arrowed cell and the edge of the grid. (Note that some arrows point diagonally, and that it is allowed for unused cells to share corners with each other.)