Logic Masters Deutschland e.V.

Normal Sudoku rules apply. Place the digits 1-9 exactly once in every row, column, and 3x3 box.

Lavender lines in the grid are zipper lines. Digits equidistant from the line's center must sum to the same value. If a zipper line has an odd number of cells, the central cell's digit defines this sum. [Digits may repeat on these lines if allowed by other sudoku rules.] For example, a valid zipper line could be 3146253 which has a sum value of 6.

Skyscrapers: Digits in the grid represent skyscrapers, with their values corresponding to their heights. Taller skyscrapers obscure all shorter skyscrapers behind them. Clues outside the grid indicate the number of skyscrapers that can be seen in that row/column, from the line of sight of the clue.

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Play on Sudokupad