Logic Masters Deutschland e.V.

This puzzle was set for one of Scojo's Setting Saturday prompts, where we had to use Dutch Whispers as the main constraint in the puzzle. I thought it would be fun to have the lines go outside the grid, so I combined it with SkyScrapers.

Sudoku: Within the main 9x9 grid, each row, column and 3x3 box must contain the digits 1-9 once only.

Skyscrapers: Cells outside the grid must contain the number of 'buildings' seen from that position looking into and across the grid from that position, where each cell within the grid represents the height of a building, and taller buildings obscure the view of shorter ones.

Dutch Whispers: adjacent cells along an orange line must differ by 4 or more.