Quads and Rotational Symmetry
(Published on 16. September 2025, 08:38 by RailMan)
Normal Sudoku rules apply. Place the digits 1 - 9 once in every row, column and box.
Quads: Digits in a white circle must appear in a cell touching the circle.
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.
Eg. R1C2 and R9C8 must add to 10.
Eg. R5C4 and R5C6 must add to 10.
Solve Online : Solution Check is enabled
Try the previous puzzle in this set
Solution code: Row 9
Comments
on 17. September 2025, 01:16 by Kirra
So much fun. Thanks for the puzzle
RailMan: Thank you, I', glad you enjoyed it.
on 16. September 2025, 22:11 by Rollo
Das macht Spaß :-)
RailMan: Danke schön
on 16. September 2025, 14:56 by Karitsu
Good fun. Super approachable. Toward the end, I was torn between whether to just speed through with sudoku or wait to see how much solved using the rotational symmetry. I opted for the faster sudoku approach, but may play again ignoring sudoku unless I hit a wall.
RailMan: Thanks, I'm glad you enjoyed it. The symmetry can get you about half way through the puzzle, but eventually you do need sudoku.
on 16. September 2025, 11:20 by superkinkel
Nice one, but I found it fairly easy, so rather 1 star.
RailMan: Thank you
