⛐ Country-Road-Loop ⛐
(Published on 16. March 2024, 07:15 by ElChiglia)
---- RULES ----
Irregular Sudoku rules apply: Fill the grid with digits 1 to 9 appearing once each in every row, column, and outlined region.
Country-Road Parity Loop: Draw a single 1-cell-wide loop of orthogonally connected cells into the grid that enters no cell more than once. Adjacent digits along the loop have opposite parity. Note, the loop can touch itself. The loop must enter every outlined region exactly once and if two cells that share an edge belong to two different regions, at least one of the cells must be part of the loop.
Circles: Digits in circles count the number of loop cells in the respective region.
---- LINKS ----
Solve this puzzle using SudokuPad
This Sudoku is part of my series of "build-your-own-loop Sudokus". If you liked solving this puzzle or if you prefer other combinations of loop logic and constraints, feel free to give the other sudokus of the series a go too:
| Loop Logic | Loop Constraint | Further Constraints | ||
|---|---|---|---|---|
| Modular-Sequence- Loop |
Circles | Modular Line | Thermometer | |
| Summing-Zipper- Loop |
Counting Cells | Region Sum Line | Zipper Lines | |
| Mid-Loop | Mid-Loop logic |
Entropic Line | Kropki Dots | |
| Whispering-Zipper- Loop |
Counting Cells | Dutch Whispers | Zipper Lines | |
| Super Bowl Loop |
Oponents, out-of-bounce |
Polarity Line | Kropkis, XV, Nabner, Zipper |
|
| Linesweeper Loop |
Linesweeper clues |
Parity Line | Little Killers | |
| Modular-Zipper- Loop |
Counting Cells | Modular Line | Zipper Lines | |
| Balance Loop | Balance clues | Parity Line | Little Killers | |
| Entropic-Zipper- Loop |
Counting Cells | Entropic Line | Zipper Lines X-clues |
|
| Hiking-through- the-Fog Loop |
Signposts | Dutch Whisper, Polarity Line |
Kropki Dots X-clues |
|
| Renbanimo Loop | Pentominos Guiding Cells |
Renbanimos | Kropki Dots Odd cells |
|
| Deceiving Loop | Wrogn Clues | Wrogn Clues | 9 different constraints |
|
| Count-the- Whispers Loop |
Counting Cells | German Whispers | Kropki Dot | |
| Whisper-me- Sum-thing Loop |
Line-sums | German Whispers | Kropki Dots | |
| Road Running Loop |
Road Runner | Parity Line | Kropki Dots | |
| Magically Modifying Loop |
- | Incrementers, Decrementers, Nullifiers |
Magic Squares, Killer cages, Kropki Dots |
|
| Skiing Loop | Gates | German Whispers | Kropki Dot, Between Lines |
|
| Behaving Loop | 3x3 boxes | Polarity Line | Kropki Dots | |
| Magical Loop | Guiding cells | Modular Line | Magic Squares | |
| Foggy Loop | Guiding cells | Parity Line | Fog of War, Killer Cages |
|
| 10-Suȵ Loop | Moon-or-Sun | 10-Line | Killer Cages | |
| Counting Loop | Galaxies | Counting Line | Killer Cages, Kropki Dots, Quadruple Clues |
|
| Shining Loop | Moon-or-Sun | Parity Line | Killer Cages | |
| Interfering Loops | Slitherlink + Masyu |
Entropic Line + Parity Line |
Killer Cages | |
| Slithering Loop | Slitherlink | Entropic Line | Killer Cages, Little Killer |
|
| BigBang Loop | Galaxies | Parity Line | Row/Column Indexer, Kropki Dots |
|
| Summing Loop | Star Battle | Region Sum Line | Killer Cages, Skyscraper, Kropki Dots |
|
| Whispering Loop | Star Battle | German Whispers | Sandwich Sum |
Solution code: Column 8, followed by row 8
Comments
on 18. June 2024, 07:13 by virus_dave
Oof. I found the sudoku part at the end to be rough. I'm still new to this irregular sudoku style, so that made it harder still.
on 29. April 2024, 14:49 by jinkela114514
I had a little bit of trouble with the sudoku of odd digits (I can easily place all the even digits)
----
I'm glad you still made it in the end and I hope it was not too much of a bother. I agree, the odds are the most complicated part of this puzzle, they involve a few steps which are trickier, in particular if one is not used to irregular Sudoku. I think it depends a bit on how lucky one is while scanning for the next weak cell(s) and unfortunately I assume that's also why some people didn't like it that much. I had a few versions of this puzzle (including one with one circle and one given less) but this one was the only one where bifurcation (or similar techniques) was not needed :)
-- ElChiglia
on 19. March 2024, 17:58 by yttrio
Great puzzle! Definitely had to read the rules carefully, but lots of great loop-building logic followed by some interesting irregular Sudoku.
on 16. March 2024, 11:57 by sorryimLate
Haha, I had to check the rules a couple of times to realize what they did not say... This required new kind of thinking and it took some time to find a starting point, but then flowed beautifully. Well done!
