Normal sudoku rules apply.
The digits 1 and 9 are anti-queen and must not see an identical digit by chess queen's move.
Digits on arrows sum to the number in the connected circle.
Grey circles contain odd digits.
Solution code: column 1
on 19. October 2022, 15:35 by Perladel
Quite tough, but I liked the idea!
Discovering the numbers in the central box was fun