Arrow: Digits along an arrow must sum to the digit in the connect circle.
f-puzzles: https://f-puzzles.com/?id=yhk4xp79
CTC: https://tinyurl.com/bw2nhpta
Solution code: Row 9 + Column 8 (18 digits)
on 25. September 2021, 21:19 by ICHTUES
This was very hard, at least for me.
A beast of a puzzle, but very beautiful!
on 21. September 2021, 13:03 by Tilberg
Beautiful solve!