Rules:
Normal sudoku rules apply.
Little killer sum rules apply: the numbers along the indicated diagonal must sum to the given total. Digits may repeat along the diagonal.
Palindrome rules apply: lines on the grid read the same in both directions.
Disjoint group rules apply: no two cells in the same position relative to their box (e.g. R1C1 and R4C4) may contain the same digit.
Solution code: Row 2, Column 7
on 19. July 2022, 15:28 by Niverio
Very enjoyable, and palettes have been used efficiently ;)
on 29. October 2021, 22:11 by Playmaker6174
Beautiful and fantastic puzzle! Pretty challenging yet very satisfying logical path once knowing what to do next, I had a really great time with it :)
on 11. February 2021, 15:34 by cdwg2000
Chinese problem solving live broadcast address https://b23.tv/4ErnVZ
on 19. December 2020, 10:05 by cdwg2000
Very nice!