Logic Masters Deutschland e.V.

Rules:

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 German Whispers line (i.e., adjacent digits on the loop must have a difference of at least 5).

Cells with arrow clues may be either on or off the loop.
-- If an arrow cell is OFF the loop, then the digit in that cell counts the total number of loop cells in the indicated direction.
-- However, if an arrow cell is ON the loop, then the digit in that cell must NOT correctly count the total number of loop cells in the indicated direction (not including itself).