Yin Yang auf dem Torus
(Published on 3. January 2022, 08:00 by CJK)
In December 2021 there was a logic puzzle advent calender on mathebau.rocks, containing variants of standard puzzles. These puzzles are now uploaded to the puzzle portal.
02. Dezember - Yin Yang on a torus
Regeln: Put a black or white circle in every cell, such that all black circles as well as all white circles are (orthogonally) connected and there is no black or white 2x2 area.
The gird is here an torus, i.e.: If you leave it on the right, you come back into it on the left in the same row, and if you leave the grid at the bottom, you come back from above. Also, 2x2 areas of the same color cannot appear in the transition area (e.g. in the leftmost and rightmost column)
Solution code: Row 2 and column 9: S for black and w for white
Comments
on 1. December 2025, 13:42 by QuiltyAsCharged
Very interesting -- the torus has some surprising effects! I'm glad I solved it just so I could read the hidden comments. :)
Here's an online version converted to SudokuPad: https://sudokupad.app/xfmdnmrbly?setting-conflictchecker=0
@QuiltyAsCharged: Please try the already existing Penpa-Link first before generating Sudokupad links for non-Sudokus.
@CJK: I used a tool to convert the Penpa-Link to SudokuPad. I find it much easier to use on my device, so I was sharing it in case others found it useful. But I will stop sharing those links in the future. Thanks for the lovely puzzles!
on 5. March 2024, 15:02 by CJK
Online-Link aktualisiert
on 4. May 2022, 17:00 by SilBer
Achso, und das Rätsel ist wirklich ein Kunstwerk. :)
on 4. May 2022, 16:57 by SilBer
Unter der Annahme, dass es ein Masyu auf dem Torus ist, ergibt sich auch ein schöner Lösungsweg, allerdings geht es am Ende nicht auf. ;)
on 3. January 2022, 18:51 by Dotty
Really easy
