Normal Sudoku rules apply. Additionally:
1. German whispers: digits along green lines must differ from their neighbor on the line by at least five.
2. XV: cells separated by a V sum to 5; cells separated by an X sum to 10. Not all Xs and Vs are necessarily given.
3. X: digits along the main, marked diagonals cannot repeat.
4. Cells separated by the black dot have a 1:2 ratio. Not all dots are necessarily given.
F-Puzzles: https://f-puzzles.com/?id=y94nzas2
CTC: https://tinyurl.com/snapshotsudoku
Solution code: Row 6, column 6, 18 characters no spaces.