Dutch Flat Mates (Thripper Lines)
(Published on 4. September 2024, 11:30 by Flinty)
Initial Setter Difficulty: 3/5 (Potentially 2/5 after review)
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.
Thripper Lines
Digits an equal distance from the centre of a Thripper line sum to the same total, which is the value of the digit placed in that line's centre (highlighted with a bump). E.g. R1C4 + R1C6 + R3C5 = R2C5.
Special Thanks to the YouTubers
This puzzle is based on a constraint I made by adapting Zipper Lines. My original puzzle was fortunate enough to receive a CTC feature, and much more recently a Bremster feature; which helped put it back on my radar to Flatmate.
Extra Flat Mates
These excellent puzzles use the Dutch Flat Mates constraint:
The Hunt for the 5's by antiknight
Roommate Somedoku by gdc.
The streamer OlliWright affectionately calls them "Bootleg Flatmates".
I missed August!
Thank you to Marty Sears, Sujoyku, GoodCity and especially gdc who didn't get a mention in my last puzzle prior to my extended break.
To play this puzzle please click here: Play CTC
Hint to Start
The Thrippers in Box 7 and Box 9 are first very restricted by maths, and then by Flat Mates.
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 - 7 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
Solution code: Digits from Row 5
Comments
on 14. October 2024, 05:07 by Frank Puzzles
https://youtu.be/bmWwjV7PYZA
Here's a link to my solve of the puzzle. Fun puzzle!
on 8. September 2024, 19:27 by Baklin
On my first try I couldn't figure it out. Not even after reading the hint.
But starting fresh after 2 days It clicked and took me around half an hour to solve.
Enjoyed it that time.
on 5. September 2024, 16:21 by Rockon101000
I found this one to be much harder to wrap my head around than the average Dutch flat mates, but once I wrapped my head around the logic, it was very satisfying.
on 4. September 2024, 17:19 by gdc
Yay! More thripper lines! As always, nice interactions with the DFM. And very smooth if you ask the right questions.
on 4. September 2024, 15:52 by sujoyku
Thank you for this amazing puzzle, Flinty! It is so packed with fun deductions and the interaction of the constraints felt well-balanced. Very neat setting!
