Dutch Flat Mates (Circuit Boards)
(Published on 27. November 2024, 11:30 by Flinty)
Normal Sudoku rules apply
Place the digits 1-9 so that they do not repeat in any row, column, or 3x3 box.
Dutch Flats
Every 5 in the grid must have a '1' directly above it or a '9' directly below it. It may have both, but it doesn't need both.
Circuit Boards
Digits at the endpoints of each gold or silver line are the same as each other (i.e R3C2 is the same digit as R2C5) and the value indicates exactly how many unique digits are on that line.
Special Thanks
This puzzle was inspired by Circuit Board by Jaze. Which you can see Simon from CTC solve here.
More guest setters are on the way!
The next 2 weeks see the return of Damo_89 with Double Arrows, and Black_Doom making his Flat Mates debut with Chinese Whispers.
Once you have solved the puzzle, there is a hidden LMD comment that provides the link to a YouTube video where I give a short insight into this puzzle. Big thanks to Palpot for humouring my rework of the final clue, along with helping me look at many different versions.
To play this weeks Dutch Flat Mates, please click here: Play CTC
Hint to start
The digits in the middle row of box 2 is the intended break-in. Using the fact that ends of lines are the same digit.
Hint for later
Unique digits is the issue for the longest line, and finding a home for enough digits on the line.
Example Puzzle
Small example image, covering the basics of the rules.
The gold line has 4 unique digits (1245), with 4 on each end.
The silver line has 3 unique digits (367), with 3 on each end.
This Weeks Puzzle
Previous puzzles in the Dutch Flat Mates series:
- #01 - 18 Oct 23 - Classic
- #02 - 25 Oct 23 - Thermometers
- #03 - 01 Nov 23 - German Whispers
- #04 - 08 Nov 23 - Region Sum Lines
- #05 - 15 Nov 23 - Sandwich Sums
- #06 - 22 Nov 23 - Little Killer
- #07 - 29 Nov 23 - Kropki
- #08 - 05 Dec 23 - Zipper Lines
- #09 - 12 Dec 23 - Renban - By GoodCity
- #10 - 19 Dec 23 - Nabner - By GoodCity
- #11 - 26 Dec 23 - Skyscrapers - By GoodCity
- #12 - 03 Jan 24 - Dutch Whispers
- #13 - 10 Jan 24 - Killer Cages
- #14 - 17 Jan 24 - Arrows
- #15 - 24 Jan 24 - Ten Lines
- #16 - 31 Jan 24 - 159 Index and Even - By GoodCity
- #17 - 07 Feb 24 - Friendly Cells
- #18 - 14 Feb 24 - Quads
- #19 - 21 Feb 24 - Silent Killer - By GoodCity
- #20 - 28 Feb 24 - XV and Equality
- #21 - 06 Mar 24 - X-Sums
- #22 - 13 Mar 24 - Numbered Rooms - By GoodCity
- #23 - 20 Mar 24 - Diagonal X-Sums
- #24 - 27 Mar 24 - Yin Yang (Neighborhoods) - By Palpot
- #25 - 03 Apr 24 - Hit Points
- #26 - 10 Apr 24 - Counting Circles
- #27 - 17 Apr 24 - XY Difference - By GoodCity
- #28 - 24 Apr 24 - Double Sandwich Sums
- #29 - 01 May 24 - Foggy Knights
- #30 - 08 May 24 - Look and Say Little Killer
- #31 - 15 May 24 - Slingshot - By GoodCity
- #32 - 22 May 24 - 258 Index and Odd
- #33 - 29 May 24 - Rellik
- #34 - 05 Jun 24 - Search 9 - By Palpot
- #35 - 12 Jun 24 - Diagonal Outside
- #36 - 19 Jun 24 - Entropic Snake - Collab with Palpot
- #37 - 26 Jun 24 - Rossini - By GoodCity
- #38 - 03 Jul 24 - Pointer Arrows
- #39 - 10 Jul 24 - Same Difference - by Marty Sears
- #40 - 17 Jul 24 - Battenburg and Average Arrows
- #41 - 24 Jul 24 - Omnipotent Lines - by Sujoyku
- #42 - 31 Jul 24 - Modular Snake
- #43 - 07 Aug 24 - Hot and Cold Lines - by Marty Sears
- #44 - 14 Aug 24 - Minmax Quads - by Sujoyku
- #45 - 21 Aug 24 - Quad Sums - By GoodCity
- #46 - 28 Aug 24 - Entropic Whispers - by gdc
- #47 - 04 Sep 24 - Thripper Lines
- #48 - 11 Sep 24 - Index Lines - by Marty Sears
- #49 - 18 Sep 24 - Kroopki Doots - by Damo_89
- #50 - 25 Sep 24 - Frameless / X-Less X-Sums
- #51 - 02 Oct 24 - Full Rank - By GoodCity
- #52 - 09 Oct 24 - Japanese Sums
- #53 - 16 Oct 24 - Chaos Construction Shifter - Collab with Palpot
- #54 - 23 Oct 24 - Ten or Eleven - By Marty Sears
- #55 - 30 Oct 24 - Split Peas - By SamuPiano
- #56 - 06 Nov 24 - Zombie (Cages) - Collab with Palpot
- #57 - 13 Nov 24 - Sharing Cages - by Sujoyku
- #58 - 20 Nov 24 - Domino Flat Mates - by Prof.Dori
Solution code: Digits from Row 8 - Info only: Are you aware that SudokuPad has a clipboard (copy/paste) functionality in the advanced settings? :)
Comments
on 3. February 2025, 13:04 by puzzlepandit
Very nice and smooth flow. The puzzle flows exactly as intended.
on 29. November 2024, 17:25 by Norkas
There's going to be the day I solve one of these puzzles and won't be stuck for 10 minutes having forgotten about the DFM constraint. But it wasn't today. Don't know what it's exactly about this rule that always makes me forget. Fun puzzle though. Also thanks for the hint on that copy button.
on 27. November 2024, 23:27 by robokong
Lovely puzzle, as always. I haven't done circuit boards before, so it took me some time, but it worked really well and felt good to solve.
Also, thanks a bunch for the video (and the copy/paste PSA)!
Flinty: Thank you, and you are welcome. :)
on 27. November 2024, 18:40 by lmdemasi
Great puzzle. You eventually run into a wall if you forget about the dutch flat mates constraint.
Flinty: Thanks, I think - haha. :)
on 27. November 2024, 18:26 by sujoyku
Thank you for this lovely puzzle, Flinty! Dutch Flat Mates for the win. :)
Flinty: Thank you my friend, I'm still waiting for your next draft for the series - haha. :)
on 27. November 2024, 16:22 by goodcity
Loved the logic on this one, great last version !
Flinty: Thank you my friend. :)
on 27. November 2024, 15:24 by wuc
Break in took a while. Very fluent rest. Great fun thx.
Flinty: Thank you. :)
on 27. November 2024, 13:39 by da-hans
Another very nice addition to the series.
Flinty: Thank you. :)
on 27. November 2024, 12:42 by marcmees
Nice break-in. Enjoyed the logic of the longest circuit breaker. Thanks
Flinty: Thank you. :)
