The Christmas season means red and green everywhere, like holly with berries decking halls. Red and green, red and green. Such contrast! Red like stop, green like go. Red like danger, green like success. Like targeting, but successful. Speaking of contrast, red and green are are also the colors of Parity Lines (odd versus even) and German Whisper lines (high versus low).
Rules:
Normal Sudoku rules apply.
Digits along hollow red Parity Lines alternate between even and odd.
Consecutive digits on solid green “whisper” lines differ by at least five.
Estimated difficulty: 3 out of 5
