Normal sudoku rules apply. Digits don’t repeat in a cage and sum to the given total, if indicated. All instances of five of the nine digits, to be determined, constitute an area of orthogonally connected cells, a "labyrinth". The other four digits are considered "walls". An arrow appears in a "dead end" of the labyrinth pointing to the only way out, i.e. the only labyrinth cell to which it is connected. All arrows are given. A white dot joins consecutive digits (not all white dots are given).