Logic Masters Deutschland e.V.

Rules:

Normal sudoku rules apply.

Nurikabe: Each cell is either water or land. A group of orthogonally connected land cells form an island, and digits may not repeat within an island. Water cells form one orthogonally connected region, and no 2x2 area may be entirely water. A digit’s value in a land cell is the digit itself and a digit’s value in a water cell is the digit’s opposite. For example, a “3” in a land cell is 3 and in a water cell is –3.

Killer: Digits cannot repeat in a cage and the values sum to the given clue.

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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