Colorado 15
(Published on 24. August 2025, 14:20 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 possible Xs and Vs are given.
Lockout Lines
Digits on the blue line cannot be between the digits in the two corresponding endpoint diamonds. Digits in endpoint diamonds must differ by at least 4.
Link:
SudokuPad
Solution code: row 9
Comments
on 18. December 2025, 21:36 by iffy
Went very smoothly once I finally reread the rules and saw the negative constraint.
on 18. December 2025, 00:18 by sparkymanu
As expected I'm loving the whole serie, I will take great pleasure solving all of them! :D Again thank you for sharing these!
on 17. December 2025, 09:12 by zenas777
it's so interesting! i color the cells in a beautiful way, i mean is it why the name is called colorado? ahhaha. I really love this one, even though it takes me really long time!
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Yes, that's why it's called Colorado :-) "Colorful Colorado"
on 16. December 2025, 14:01 by itsid
well, there is in fact one thing I do not like about this puzzle...
and that's that there is no colorado puzzle left that I haven't played :(
Thank you for the series, it was great fun
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Thank you so much for solving the entire series and your kind comments. And don't worry... Colorado 16 will be released very soon :-)
on 29. August 2025, 13:26 by Onkel_Dagobert
Die Auflösung am Schluss ist sehr originell. Ich kann immer wieder nur staunen, wie man auf so eine Idee kommen kann. Großartig!
on 25. August 2025, 21:55 by BG03
Thank you for a wonderful puzzle. As commented earlier, the lockout line was a great unlock. It felt like playing a long game of chess and forcing checkmate with the last few moves!
on 25. August 2025, 18:17 by Florian Wortmann
Thanks everyone! Glad you liked the puzzle :-)
on 25. August 2025, 17:09 by PinkNickels
Another banger!
on 25. August 2025, 13:18 by Franjo
Yeah, that the little line would do the work in the end was expected, but until it did so I couldn’t imagine how… Great setting! Thank you very much for creating and sharing this brilliant puzzle.
on 25. August 2025, 02:38 by NorthCoastAsher
Very well constructed and satisfying ending!
on 25. August 2025, 01:17 by chubnatty
Such a satisfying ending. Thanks for a great puzzle!
on 24. August 2025, 21:40 by Snaques
This was very fun. I just wish I had a more effective way to "color" each cell with all the restrictions it has.
on 24. August 2025, 17:18 by AnebodaSlatorp
Thank you! Another lovely Colorado
