Logic Masters Deutschland e.V.

Rules:

• Within the main 9x9 grid, normal sudoku rules apply.
• German Whispers: adjacent digits on the green lines must differ by at least 5.
• Skyscrapers: digits in the grid represent skyscrapers of that height, with taller skyscrapers obscuring smaller ones. Clues outside the grid (which are to be determined by the solver) show the number of all visible skyscrapers from the clue's direction.
• Note: solution check includes skyscraper clue values that are on the lines.

SudokuPad

P.S. The rectangular shape sticking out of box 1 is a little nod to yttrio's brilliant Slanted Summer Rooms, which was the the first puzzle with clues going out of bounds I'd seen. Go check it out!