Lighthouse
- XV and number dots
- Negative constraint
- Kropki dots
The brief
Normal sudoku rules apply.
The sum of the digits along a line connecting two circles is equal to the sum of the digits in the circles.
Adjacent digits along a green line must differ by at least 5.
Digits separated by a V must sum to 5. Not all V are given.
Any two orthogonally adjacent cells cannot contain digits in a 1:2 ratio.