4 Lines
More from Dr Logic
- Diagonals
- Zipper lines
- Region sum lines
The brief
Normal Sudoku Rules Apply. Each line is both a region sum line and a zipper line. -Region Sum Line: Box borders divide each red line into segments with the same sum. -Zipper Line: Digits equidistant from the centre of the line (marked with a red circle) sum to digit in the centre of the line. Digits cannot repeat on each marked diagonal.