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Alternate Loop

Author: Anurag Sahay

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Draw a single continuous loop in the grid using horizontal and vertical line segments so that the loop visits every square exactly once. It should not cross or overlap itself. Circles should alternate their color while following along the line.

Example puzzle

Grid control: To draw a line press the mouse button at a start cell and move mouse to another cell holding the button. More details about grid control are at the help page.