Logic Masters Deutschland e.V.

Every row column and box must contain the digits 0 to 8.

Digits in the grid represent the heights of skyscrapers. Clues outside the grid indicate how many skyscrapers are visible in the direction of the clue in its row/column, where taller skyscrapers obscure shorter ones.

There are 9 cells consisting of a set of the digits 0-8 representing condemned skyscrapers throughout the grid. There is exactly one condemned skyscraper in every row, column, and box. The height of a condemned skyscraper is considered to be zero. A skyscraper with a height of 0 is never visible to a clue outside the grid.

Heights of skyscrapers connected by a white dot must be consecutive and the height of one skyscraper on a black dot must be equal to two times the height of the other skyscraper on that dot. Not all possible dots are given.

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