Logic Masters Deutschland e.V.

Chaos Construction: Color Mixing

(Published on 15. May 2022, 17:41 by KNT)

Place the numbers from 1 to 9 exactly once in every row, column, and region. Each region is orthogonally connected and must be located by the solver.

There are three properties: red, yellow, and blue. A colored cell obeys the properties, and only the properties, of the primary colors that compose it.

Red: the number indicates the total count of cells in the same region as itself in the surrounding 3x3 area.

Yellow: the number indicates the total count of cells not in the same region as itself in the surrounding 3x3 area.

Blue: the number indicates the number of distinct regions in the surrounding 3x3 area.
Explicitly:

Orange = Red + Yellow

Green = Yellow + Blue

Purple = Red + Blue

White (grey) = Red + Yellow + Blue

A 1-6 example is provided:

SudokuPad

penpa+

Solution code: Row 3 followed by Column 7

Last changed on on 1. January 2026, 19:48

Solved by ancarro, Jesper, kolot, Niverio, jkuo7, Franjo, Elliott810, Vebby, MagnusJosefsson, ns08, ma3n, Mip, henrypijames, PixelPlucker, polar, Koalagator2, Jaych, harrison, Piatato, Martijn314, lerroyy, ... StephenR, h5663454, TitaniaLowe, zakkai, Nick Smirnov, Christounet, MicroStudy, dogfarts, Paletron, han233ing, JDP678, wullemuus, haoju, zzw, SeveNateNine, mizukihan, Zzzzz..., zhugelianglongming
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Comments

on 19. January 2024, 21:44 by Christounet
Very nice ! The hardest part for me was not mixing the color of the circles and the regions. Thanks :)

Last changed on 26. December 2023, 03:18

on 26. December 2023, 03:17 by Nick Smirnov
Very interesting ruleset. Regions building logic was exquisite (with some cool traps punishing for lack of attention), but I also liked that irregular sudoku part was quite challenging.

on 31. July 2023, 11:13 by StephenR
More Stuckist than Impressionist for me! Really tough and never felt I had mastered it until near the end when things came together. Very clever puzzle, thanks.

on 31. May 2023, 21:31 by ibag
Very nice - as usual! ;-)

on 21. August 2022, 23:41 by Piatato
Very nice and relatively smooth one! Great ruleset. :-)

on 21. June 2022, 20:21 by PixelPlucker
Very memorable original ruleset and a lovely solve. Criminally underrated puzzle in my opinion. Thanks! :)

on 20. May 2022, 11:23 by MagnusJosefsson
Fun and original! Quite challenging for me, possibly five stars difficulty in my opinion.

on 16. May 2022, 12:50 by Niverio
Challenging! I was never completely sure of the deductions I made. Beautiful puzzle though!

Although a note, is there a way to put the circles such that the circle color doesn't change when we color the cells? It annoyed me to no end when I was coloring regions, that I had to sometimes uncolor just to remember which color the original circle was.

on 16. May 2022, 12:01 by kolot
Fun rule set and fun puzzle. Challenging from start to finish.

Difficulty:5
Rating:97 %
Solved:45 times
Observed:14 times
ID:0009V3

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Solution code:

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