Standard Sudoku Rules apply to the final numerical layout.
A number in a white circle is the sum of three of the four digits surrounding that circle; specifically the highest digit plus the lowest digit plus one of the other two. Digits do not repeat around any circle.
The same is true of the Little Killer arrows: The number is the sum of the highest digit on the diagonal plus the lowest digit plus one of the other two digits. For this puzzle, digits do not repeat along Little Killer diagonals!
Solution code: Row 8, then Row 9
on 20. December 2021, 18:19 by Shearing
The hardest puzzle I've ever solved. Thank you very much!
*** You're welcome, and thank YOU for diving into it!
on 20. December 2021, 15:49 by PixelPlucker
Excellent idea and puzzle!