Colorado 9
(Published on 17. September 2023, 15:09 by Florian Wortmann)
Normal sudoku rules apply.
XV
Digits joined by an X sum to 10. Digits joined by a V sum to 5. All Xs and Vs are given.
Consecutive Pair
Digits joined by the white dot are consecutive. Not all white dots are given.
Antiqueen
The digit 9 must not repeat in any diagonal direction.
Link:
CTC-App
Solution code: row 9
Comments
on 1. August 2025, 22:46 by PancakePie
The two step untangling is so elegant and cool!
on 25. June 2025, 10:17 by ShankSpencer
With the right colour choices, this series is so pretty, as well as fun.
on 28. February 2024, 14:31 by itsagift
Love coloring puzzles! I do wonder if it was correct to assume the negative constraint for the 9 diagonal rule. For example, if a digit doesn’t repeat, it must be 9.
on 27. December 2023, 22:00 by chain.reader
clarifying the rule:
the 9 constraint is for *all* diagonals, not just the main 2 big ones. ie. akin to a queens move constraint for 9s.
on 21. October 2023, 06:47 by rdesmarais2
Simon would have been proud of me how I colored your puzzle.
on 19. September 2023, 00:31 by snuuba
Very nice. Looking forward to see part 10 :)
on 18. September 2023, 19:37 by GeorgeTheToad2
Colours and letters helped here. Colours for high low and letters to determine which of the highs could be a 9. Still took 40 minutes but I enjoyed every minute. Thank you for sharing.
on 18. September 2023, 07:55 by Florian Wortmann
Thanks for solving and commenting, folks! Glad you enjoyed the puzzle :-)
on 17. September 2023, 21:32 by drbs
Very nice! By the end I had forgotten the 9‘s constraint.
on 17. September 2023, 21:17 by Bartenbruch
Fun colouring puzzle, though I got stuck at some point until I realised that there was a negative constraint.
on 17. September 2023, 19:52 by RedBarchetta
I love love love XV negative constraint puzzles. I was banging my head against the wall before I applied all the rules. Fun to color and fun to solve. Thanks!!
on 17. September 2023, 18:59 by ArnulfKoch
Your Colorado series are the best puzzles! So nice coloring und smooth to solve.
on 17. September 2023, 17:28 by Flycatcher
My favorite series returns! I hope you will do Arizona next. :)
on 17. September 2023, 15:46 by sujoyku
Thank you for this fun puzzle, Florian Wortmann! Solving your previous Colorado puzzles was a great training for this one. I really enjoyed the twist with the anti-queen constraint on 9s. Thank you for setting and sharing!
