XV = X-ray Vision
- Killer cages
- Kropki dots
- XV and number dots
- Negative constraint
The brief
Normal Sudoku rules apply. Digits joined by an X sum to 10. Digits joined by a V sum to 5. All X and V are given. NEGATIVE CONSTRAINT: Digits that are NOT joined by a V or an X do not sum to either 5 or 10. Digits in a killer cage do not repeat and sum to the clue in the top left. Digits joined by black dot have a 1:2 ratio. (Not all dots are given.)