Arrow: Digits along an arrow must sum to the digit in the connected circle.
Clones: Regions of the same color and orientation are clones. Digits must appear in identical positions in all instances of a clone. Digits may repeat in a clone if allowed by the other rules.
f-puzzles: https://f-puzzles.com/?id=y6zvvmfv
CTC: https://tinyurl.com/2eh38y3t
Solution code: Row 9 + Column 5 (18 digits)