Logic Masters Deutschland e.V.

Krazy Kropki (my first puzzle!)

(Published on 14. July 2025, 00:57 by Dave Brenn)

***BEWARE***
Those dots are NOT what you expect
Normal sudoku rules apply: Place the digits 1-9 once each in every row, column and 3x3 box.
Multiplier: Each 3x3 box contains a UNIQUE multiplier. The value of the multiplier is the digit in the upper left square of that box. (Eg. if r1c4 is 5, the multiplier for box two is 5).
Cages: All digits in a cage are summed together and treated as one value for the purpose of Kropki relationships.
KRAZY Kropki dots: Digits and/or cage totals separated by a black Krazy Kropki dot are in a ratio of X:1 (one digit or cage total is X times the value of the other), where X is the multiplier for the 3x3 box containing that dot.
If a Krazy Kropki dot lies on the border between two boxes, the player must determine which of the two box multipliers to use for that dot. (Eg, if the multiplier for box five was 3, and box six was 7, a Krazy Kropki dot between those two boxes could be either a 3:1 ratio or a 7:1 ratio).
White Kropki Dot: (standard) Digits separated by a white dot are consecutive.
Not all dots (Krazy or otherwise) are necessarily given.
Play the puzzle on Sudoku Pad

Solution code: All 9 multipliers in reading order, right to left, top to bottom

Last changed on on 15. July 2025, 04:56

Solved by Joyofrandomness, PierreTombal, ableite, misha, SKORP17, rameshsrivats, sanabas, Exigus, Allagem, GorgeousNicko, steinvz, Crul, anotherpaulistring, houellebecqqq, zrbakhtiar, RockyRoer, teuthida, ... Vaurien, jkuo7, mew_rocks, Elliott810, annnz, sorryimLate, ChsSlyr9k, saiifh, P12345, Khatru, OGRussHood, garage, Druselbert, SudokuHero, peep50183, dellC, madhupt, nocturnomath, JVA, Cryccu
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Comments

on 20. July 2025, 11:36 by teuthida
Very unique rule, thank you for setting! The rules of krazy kropki dots are really well explained step by step right now in my opinion, I had no problem with it. Somehow I missed the uniqueness, but that's on me.

One thing that confused me is the solution code: what worked for me is left to right, not right to left.

on 19. July 2025, 07:50 by clock
Since I'm not a native English speaker, there are some points in the rules that confuse me a bit – does UNIQUE mean that the multipliers in each box are different from each other?

Last changed on 15. July 2025, 06:58

on 15. July 2025, 03:50 by Allagem
This is a great debut puzzle! It's creative, well-crafted, and a pleasure to solve! I think the only problem is you invented a constraint that is impossible to describe concisely :) Both the information conveyed by each black dot and which digits the conveyed information is about is dependent on the black dot's location! Nevertheless, a joy to solve after the rules are properly understood. Well done! :)

**
-Thank you so much!! Yes I’ve really been struggling to find a better way to explain it. I’ve updated the rules with some clarification that will hopefully make sense

Last changed on 15. July 2025, 06:57

on 15. July 2025, 01:47 by Exigus
Good work. Thanks

**
Thank you for trying my puzzle!

Last changed on 15. July 2025, 05:15

on 15. July 2025, 01:45 by sanabas
Good fun. A lot more approachable than it first appears.

I'd suggest something like: If a black dot separates two uncaged digits, those digits are in a 1:N ratio, where N is the multiplier of the box the dot is in.
If a black dot separates an uncaged digit and a caged digit, then the cage's sum and the uncaged digit are in a 1:N ratio, where N is the multiplier of the box the dot is in.
If a black dot is on a box border, then N may be the multiplier of either box, it is up to the solver to determine which.
***
Thank you for the advice! I’ve made an adjustment to the rules for clarity, hopefully it’s easier to understand

Last changed on 14. July 2025, 22:07

on 14. July 2025, 17:03 by rameshsrivats
Nice fun puzzle. Great debut. Waiting for your future puzzles.

-Thank you so much! It would help me a lot of you could leave a rating too

Last changed on 15. July 2025, 00:33

on 14. July 2025, 15:52 by misha
Congratulations on your first puzzle! A fun solve.

The confusing rule seems to be that if one of the digits on a kropki dot is in a cage, the value is the cage's total, not the digit.

-thank you! Yes I’m working on a way to word that more clearly

Last changed on 14. July 2025, 13:26

on 14. July 2025, 10:12 by PierreTombal
Nice puzzle. Had to reread the rules a couple of times but after that it went very smooth.

-Thank you! I’m working on a clearer version of the rules, if you have ideas I’d appreciate it!

Last changed on 14. July 2025, 13:25

on 14. July 2025, 08:00 by SudokuFan
right to left reading order for the solution code?

-Yes, right to left

on 14. July 2025, 03:32 by Dave Brenn
Mattisahuman, the digit in the cage is not in a ratio as its own value. The whole cage is calculated as the total value for that side of the dot. I would appreciate a better way to express this in the rules if you have an idea. Maybe the “and/or” is the confusion. I included the “and/or” to allow for the two different cases. Case 1: the dot is between two digits. Case 2: the dot is between a single digit and a cage

on 14. July 2025, 02:20 by Mattisahuman
Could you clarify what you mean by “ Digits and/or cage totals separated by a black dot”? Does this mean that a cell within a cage that has a black kropki dot on it is simultaneously in a ratio as its own digit AND its cage’s total? Or just one of those things?

Difficulty:2
Rating:95 %
Solved:40 times
Observed:2 times
ID:000O7L

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Solution code:

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