Counterrotation
Rules:
1. Standard: Normal sudoku rules apply.
2. Arrow: Digits on arrows sum to the digit in the connected circle.
Solution code: Columns 8 and 9 (18 digits, no spaces or commas)
on 18. January 2024, 21:40 by glum_hippo
Proud to get through this one, though I made several steps that I felt very unsure about.
on 15. November 2021, 13:09 by bosjo
Great puzzle; visually appealing and smooth logic. Also, a great corollary to the »Phistomefel theorem»...