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Japanese Railway (931)
Instruction:
Blacken some cells, and then draw a single loop that passes orthogonally through centers of cells.
Numbers outside the grid, when given, indicate the sizes of all continuous groups of blackened cells along that row or column, in positional order. These groups are separated by unblackened cells.
The loop must go through all non-black cells and cannot go through any black cells. The loop intersects itself in the cells marked with a crossing. The loop may not enter the same cell more than once except at these marked crossings. The loop must go straight through the cells with numbers, and it must go through these numbers in numerical order (starting over at 1 once all cells have been reached).