Normal sudoku rules apply. Draw a one-cell-wide loop of orthogonally connected cells. The loop may not touch itself, not even diagonally. The loop acts as a Dutch Whispers line (i.e., adjacent digits on the loop must have a difference of at least 4). Japanese Sums: Clues outside the grid give the sums of loop segments in the respective row or column, in order, where cells not on the loop separate segments. A question mark indicates any digit from 0 to 9, but no clue may have a leading zero. An asterisk denotes an arbitrary number of Japanese sum clues. This could be zero, one, or multiple.