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In this closed-loop-drawing puzzle, the loop passes through all the cells with circles. At white circles, the line travels the same number of cells on either side of the circle before turning, and at black circles, it travels a different number of cells on each side before turning. A number on the circle tells the sum of the straight segments on each side of the circle up to the next turn, even if the path goes through other circles before turning.
MIT Mystery Hunt 2022 Dancing Triangles