Rotationally Symmetric Constraints
(Published on 26. February 2026, 22:11 by RailMan)
Normal sudoku rules apply. Place the digits 1 - 9 once in every row, column and box.
Rotational Sums of 10: All digits in the grid have a 180 degree rotational opposite. Every digit and its rotational opposite add to 10. Eg. R1C2 and R9C8 must add to 10. Eg. R5C4 and R5C6 must add to 10.
Killer Cages: Digits in cages cannot repeat and must sum to the total shown.
Palindrome: Digits on the grey line must read the same from both ends.
Kropki Dots: Digits separated by a white dot are consecutive. Digits separated by a black dot are in a 1:2 ratio. Not all dots are given.
Solve Online : Solution Check is enabled
Solution code: Row 9
Comments
on 3. March 2026, 17:32 by Anthony
This was extremely fun to solve. I think the break in is nigh on 2 stars, but still very intuitive.
RailMan: Thank you
on 3. March 2026, 10:41 by Supalea
I loved this❤️
RailMan: Thank you
on 27. February 2026, 23:58 by henryng
This is awesome, but I think the breakin is harder than one star—super interesting though!
RailMan: Thank you. I also thought it would be 2*
on 26. February 2026, 23:08 by GeorgeTheToad2
Clever construction. Amazing solve experience.
RailMan: Thank you very much.
on 26. February 2026, 22:51 by pjot
Beautiful!
RailMan : Thank you.
