Logic Masters Deutschland e.V.

Puzzle rules:

• Normal sudoku rules apply.
• XV: Cells joined by a V must sum to 5.
• Region sum line: Box borders divide the blue line into segments. Digits in each segment sum to the same value.
• German whisper line: Two cells connected by the green line must have a difference of at least 5.
• Skyscrapers: Clues outside the grid show how many cells can be seen from that direction. Higher digits block the view of lower digits behind them.