Skydoku

Skydoku

Rules:

  • Classic Sudoku:

    Every row, column and 3x3 box must contain every number from 1 to 9.

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  • Skyscrapers:

    Each digit in the grid represents the height of a building in its cell, and taller buildings obstruct the view of shorter ones behind them: clues outside the grid give the number of buildings visible from that vantage point in the clue’s row or column.

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Play it online in SudokuPad.

This puzzle is also on Logic Masters Germany.