Special Thanks
Wow, number 100?!? This was so far from likely when I started this series, that it didn't even cross my mind that we might make 10 puzzles, neither mind a century of them! Thank you so much to everyone who has set, tested, and especially attempted/solved the puzzles within the series.
Previous Dutch Flat Mate Puzzles
This has been a weekly series since '18 Oct 23'. Here is a spreadsheet link for all the previous puzzles in the series, which also has a few teasers for upcoming constraints/guest setters in the series (subject to change).
This alternative link offers a limited LMD search for Dutch Flat Mates.
To play the puzzle, please click the image:
Initial Setter Difficulty: 2.5 / 5
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.
Coloured Sums
Clues outside the grid indicate the sum of the digits in the cells of the corresponding colour in that row or column.
Odd = Total must be odd.
>4 = Must be greater than 4.
Hint to start
A lot of the totals are surprisingly forcing, particular if you want to keep 5 happy.
Guests Setters
We start the 2nd century* with a bang, with something zifferent from the one and only Marty_Sears!
*completing the second century is not necessarily the goal!
Solution code: Digits from Row 3 (left to right)
yesterday, 07:42 by Exigus
Thank you for a great series!
on 10. September 2025, 14:33 by sujoyku
Thank you for this amazing series, Flinty! On to the next hundred!
Flinty: Thank you so much mate. :) It's looking like I'm copy/pasting this 'thanks' because I am - haha - but I am reading them and appreciating them all. <3
on 10. September 2025, 10:32 by da-hans
Thank you for the series. I don't solve many sudokus here at the moment but always give the DFM puzzle a try. Keep it up. For this puzzle I gave 2 stars in difficulty.
Flinty: Thank you so much. :)
on 10. September 2025, 09:28 by marcmees
Thanks for the guaranteed wednesday treat.
Flinty: Thank you so much. :)
on 10. September 2025, 08:47 by zeniko
Congratulations on the impressive milestone! 100 thanks for sharing.
Flinty: Thank you so much. :)
on 10. September 2025, 08:44 by 72kchunshuai
Nice flow! One hundred percent extraordinary series.
Flinty: Thank you so much. :)
Please note: The German version of this page has changed. It is possible that this page does not contain the latest information.