Logic Masters Deutschland e.V.

Rules:

Normal sudoku rules apply.

Yin Yang: Shade some cells in the grid so that all shaded cells are orthogonally connected and all unshaded cells are orthogonally connected. A 2x2 area cannot be fully shaded nor fully unshaded.

Negators: A digit’s value in an unshaded cell is the digit itself and a digit’s value in a shaded cell is the digit’s negative. For example, a “3” in an unshaded cell is 3 and in a shaded cell is –3.

Skyscraper: Values of cells represent the elevation above/below sea level. Clues outside the grid equal the amount of numbers seen in that row/column from that vantage point. For example, suppose a row contains the values –3, 2, –8, 5, 4, 7, -6, –1, –9. Then 4 values are seen from the left (–3, 2, 5, 7) and 3 values are seen from the right (–9, –1, 7).

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