Normal Sudoku rules and the two main diagonals contain the digits 1-9 as well.
Kropki
Cells connected by a white dot contain consecutive digits. Cells connected by a black dot contain digits in a 1:2 ratio. Not all possible dots are given.
XV
Cells seperated by an X sum to 10. Cells seperated by a V sum to 5. All possible Xs and Vs are given.
Solution code: row 9 and column 9
on 24. October 2021, 10:58 by Florian Wortmann
Added ctc-app link
on 8. August 2021, 16:07 by Florian Wortmann
fixed tags and description
on 12. April 2021, 22:00 by JonnyKaufman
Enjoyed this one, thanks!