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Railway (179)
Other names: Railroad, Railroad Tracks
Instruction:
Draw a single loop that passes orthogonally through centers of 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).