Normal Sudoku rules.
Antiknight
Identical digits cannot be a knight's move apart.
Arrow
Digits along an arrow sum to the digit in the arrow's circle and can include repeats if allowed by the other rules.
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Solution code: row 5 and column 5
on 24. October 2021, 13:04 by Florian Wortmann
Added ctc-app link
on 8. August 2021, 16:15 by Florian Wortmann
fixed tags
on 17. July 2021, 15:06 by chris21
Very nice. Took me a while to ask the right questions about the right digit(s).