Parity Lines

Sometimes I wish I hadn’t used “Every Other” in so many puzzle titles already, because Parity Lines are very deserving of the appellation. This puzzle was inspired by thoughts about odd and even digits, and how many of each are found within the standard set of Sudoku digits, so I thought of it as an “Every Other” puzzle until it came time to choose a title, at which point all creativity left me.

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).