Normal sudoku rules apply. Digits separated by a white dot are consecutive. Draw a single electricity cable that travels orthogonally from cell to cell, never branching, crossing, or overlapping, which eventually closes into a loop. The loop must pass through every hut. Water drops mark river borders that the loop cannot cross. Any two cells that are adjacent along the loop must contain non-consecutive digits, unless the loop is passing through a white dot (where consecutive digits may appear). Any two huts directly connected by the loop form a segment (including both huts). A digit in a hut equals the length of the longest segment containing it.