RGB
(Published on 29. May 2025, 17:07 by Kaktuslav)
Rules: Normal Sudoku rules apply. Among the digits 1–9, three are red, three are green, and three are blue (each digit has exactly one color, to be determined by the solver). Along each marked line, either all digits must be of the same color or all of mutually different colors. Lines behave differently depending on the colors of the digits they contain:
- if all digits are red, the line acts as a same-parity line (i.e. all digits are even or all are odd);
- if all are green, it acts as a German whisper (i.e. adjacent digits differ by at least 5);
- if all are blue, it acts as a region-sum line (i.e. box borders divide it into segments with the same sum); and
- if no color repeats, it acts as a renban (i.e. it contains a set of non-repeating consecutive digits in any order).
If you enjoyed this puzzle, you might like one of my previous puzzles too! Check it out here :)
Solution code: Column 2 (top to bottom, no spaces)
Comments
yesterday, 22:02 by sockerbecca
This was SO rewarding to finish! Incredibly difficult (for me personally, I'd say 4 stars is accurate, but 4-5 stars usually really test my limits).
I made progress quickly but then was stuck for a couple hours because I made such a silly mistake - a faulty assumption. I'd resorted to bifurcating to try and figure something out by that point, so once I realized my error, I started over so I could actually use the intended solving path. It was much easier that way XD
I love how the logic flowed all the way through it!
on 23. June 2026, 17:28 by knight_gx
Quite hard; the rules take a bit of getting used to.
on 11. August 2025, 00:24 by yellow
liked it a lot. hope it gets more solves! :)
