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Yajilin (Domino) (1250)
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". Every unused cell shares an edge with exactly one other unused cell; such a pair of cells is an "unused domino".
The grid contains some outlined gray cells that the loop cannot pass through. Numbered arrows in such cells indicate the total number of unused dominoes (not 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. (A domino that spans two rows is in both rows; a domino that spans two columns is in both columns.)