Unknown Origin
- Killer cages
- Anti-king
- XV and number dots
- Arrows
The brief
Normal Sudoku rules apply. Numbers that are a chess King's move away from each other cannot contain the same digit. Numbers on arrows sum to the number in the pill at the origin of the arrows. Numbers on arrows repeat. Numbers in cages sum to the number in the top left corner of the cage. All cages have something in common that is to be determined by the solver. Numbers with an X between them sum to 10.