Windshield Wipers
- XV and number dots
- Region sum lines
- Quadruples
The brief
- Normal sudoku rules apply, i.e. each row, column and 3x3 region has to contain the digits from 1 to 9 once each.
- Quadruple: Digits in a circle must appear in the four surrounding cells.
- Region Sum Lines: Box borders divide the blue lines into segments with the same sum. (Different lines may have different sums.)
- XV: Digits joined by a V sum to 5. Digits joined by an X sum to 10. Not all XV are given.