Colour me even (Yin Yang)
(Published on 3. December 2025, 00:36 by Killer Joe)
Hello.
Normal Sudoku rules apply.
Yin-Yang colouring: colour each cell using two colours so that each colour forms a single orthogonally connected region and no 2×2 area contains only one colour.
Parity counter lines: the two digits at the ends of each line indicate the number of odd and even digits in that line, including the end digits themselves. One digit counts odd digits; the other counts even digits.
Colour-parity interaction: all digits of the same parity within a line must share the same colour. Digits with opposite parity on the same line must have a different colour. Note that a digit on the end of a line does NOT count the amount of same coloured cells.
Kropki dots: standard black and white Kropki rules apply. A black dot indicates one digit is double the other, and a white dot indicates consecutive digits.
Have fun.
Solution code: Row 9, first 6 digits.
Comments
on 9. December 2025, 05:34 by Crusader175
Cool hybrid!
on 8. December 2025, 21:53 by Hay-in-needlestack
Lovely mindbender.
on 4. December 2025, 04:31 by Exigus
That was brilliant. Very cool YY, kept me on my toes with the line ends. Thanks!
on 3. December 2025, 16:43 by nunc
I loved this original puzzle. Very nice idea, and great execution, with a smooth flow.
on 3. December 2025, 16:25 by Franjo
Nice YY-hybrid! Thank you very much for creating and sharing this lovely puzzle.
on 3. December 2025, 16:18 by iffy
Really fun puzzle. Hurt my brain a bit trying to keep colors and parities straight.
on 3. December 2025, 10:14 by Snookerfan
Lovely! I needed to internalize that different lines can have different colorings for odds and evens, which took a while. Thanks!
on 3. December 2025, 08:14 by tryote
Challenging but fun!
on 3. December 2025, 07:43 by waffles_the_dog
I lovely puzzle, and a lovely solve path once I had stopped making a complete mess of the rules :D
Thanks very much for setting it :D
