Logic Masters Deutschland e.V.

Rules

• Normal Sudoku rules apply.
• Yin-Yang Shading: Shade some cells such that all shaded cells form an orthogonally connected area, all unshaded cells form an orthogonally connected area and no 2x2 area is entirely shaded or unshaded.
• Killer-Cages: Digits in cages may not repeat and sum to the given clue. In cages, shaded digits count as positive numbers, and unshaded digits count as negative numbers.