Normal Sudoku rules apply.
Cells that are a knight's move apart (in chess) cannot contain the same digit.
The cells along an arrow must sum to the cell in the associated circle.
You can play it here: f-puzzles.
Good luck!
Solution code: Row 3 + Row 9 (18 digits)
on 15. April 2022, 12:55 by Florian Wortmann
Really nice how this resolves in the end.