Clear Kropki-Vision
(Published on 3. April 2025, 11:00 by sujoyku)
I like to thank all testers and particularly gdc who helped me with the conflict-checker. As always, your comments are much appreciated. I wish you joyful solving!
- Normal sudoku rules apply, i.e. each row, column, and 3x3 region has to contain the digits from 1 to 9 once each.
- Arrows: Digits on an arrow sum to the digit in the circle from which the arrow emerges. (The solution check requires filling also the arrow circles.)
- Skyscrapers: Digits outside the grid count the number of digits visible looking into the grid from their vantage points in their respective rows. Digits are visible when they are larger than all the digits before them.
- Visible Kropki: Digits joined by a black dot have a 1:2 ratio (no negative constraint). Moreover, any digit on a black Kropki dot is visible from at least one vantage point outside of the grid. In other words: If a digit X is on a Kropki dot, there must be at least one straight connection to the edge of the grid consisting entirely of digits lower than X.
Here you can solve the puzzle online:
Solution code: Column 7 from top to bottom (9 digits in total)
Comments
on 17. April 2025, 01:47 by Lenivaya_Joppa
Thank you for this nice puzzle, dear sujoyku! :) It took me some time to understand the skyscraper rule. At first, I did not understand that you have to look in the direction departing from the circle. I thought that it didn't matter from which direction you look on the concerning line or column and that you count the cells in which digits are somehow visible.
But once I understood, the puzzle became approachable for me. Finally I really enjoyed the solve! :)
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You are much welcome, Lenivaya_Joppa, thank you for your comment! I am glad you enjoyed the solve.
Kind regards, sujoyku
on 11. April 2025, 16:45 by ChinStrap
Loved it! The dots were even more powerful than I suspected at first, and the rest was really smooth.
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Thank you for your comment, ChinStrap! I am glad you liked it. I was also surprised how powerful the visibilty constraint proves to be. It probably could also be interesting to try that with other variants.
Kind regards, sujoyku
on 5. April 2025, 17:30 by Franjo
Originelle Idee, exquisit eingeführt in einem sehr schönen und eher leichten Puzzle. Vielen Dank dafür.
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Sehr gern geschehen, Franjo, viele Dank für deinen Kommentar! Es freut mich, dass Dir die Idee des Rätsels gefallen hat.
Herzliche Grüße, sujoyku
on 4. April 2025, 09:05 by Luigi
Was bedeutet "auf" einem Kropkipunkt?
Gilt die "Sichtbare Kropki Regel" dann für beide Ziffern "am" Kropki Punkt?
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Hallo Luigi, auf einem Kropki-Punkt bedeutet: in einer der beiden Zellen, die vom Kropki-Punkt verbunden werden. Die Sichtbarkeitsregel gilt für alle Ziffern auf den Kropki-Punkten.
Herzliche Grüße, sujoyku
on 4. April 2025, 08:27 by MSDOS
Very nice construction! I also really liked the "seen from the edge" rule, I think it can be used a lot to get some really neat logic. Thanks for setting and sharing!
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You are much welcome, MSDOS, thank you for your comment! I am glad you enjoyed the puzzle and liked the visible Kropki rule.
Kind regards, sujoyku
on 3. April 2025, 20:07 by Allagem
It took some thinking to understand how to approach this puzzle, but once I discovered where the pressure was, the logic flowed very nicely. This puzzle is very fun and has a unique feel.
Has anyone ever done this “visible cell” constraint before? Even as a standalone concept separate from the Kropki dots, it seems like it could have legs. The type of logic it pushes reminds me of Mountain Sudoku by Nylimb.
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Thank you for your comment, Allagem! I am glad you enjoyed the puzzle's flow. Regarding your question: I had assumed that someone has done this or a similar ruleset before, but I didn't have a particular puzzle that inspired the idea. It mostly came from wondering how to make the Kropkis more "Skyscraper-related".
Kind regards, sujoyku
on 3. April 2025, 15:47 by marcmees
easy & fun. thanks
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You are much welcome, marcmees, thank you for commenting! I am glad you found it to be approachable and had a fun solve.
Kind regards, sujoyku
