Logic Masters Deutschland e.V.

Rules:

Nearly normal Sudoku rules apply: Place the digits 0-8 once each in every row, column, and 3x3 region.

Boxes 1-8 of the Sudoku additionally contain a Yajilin loop (box 9 is colored yellow as a reminder that it's not part of the Yajilin portion of the puzzle, though it still is used for Sudoku). The loop will never enter box 9, and no shaded cells can be placed in box 9.

Yajilin: Draw a loop that passes through the centers of some cells. The loop can only move vertically and horizontally. The loop never crosses itself, branches, or goes through the same cell twice.

Shade some cells in the Yajilin portion of the grid. Shaded cells cannot touch each other orthogonally, though may touch diagonally.

Digits in cells with arrows are not shaded, and they give the total number of shaded cells in all given directions combined.

The loop passes through all cells in boxes 1-8 except for shaded cells and cells with arrow clues.

The loop acts as a Dutch Whispers line (i.e., adjacent digits on the loop must have a difference of at least 4).