Apply normal sudoku rules. Digits along arrows sum to the number in their connected circle. Digits along grey lines are palindromes which read the same from either direction.
I hope you find the logic satisfying. Cheers, have fun.
Solution code: Row 9, Column 9
on 3. October 2021, 04:55 by panthchesh
What a pretty puzzle! :)
on 2. October 2021, 00:44 by Count Knersis
It is hard. I will come back to this. My mind gets stuck instead of seeing the important cell. 4 of a kind.
on 1. October 2021, 09:57 by cdwg2000
Very nice!