Dutch Flat Mates: Ziffers
(Published on 17. September 2025, 07:00 by marty_sears)
Rules:
Normal sudoku rules apply.
DUTCH FLAT MATES: Every 5 in the grid has a 1 directly above it or a 9 directly below it. It may have both, but it doesn't need both.
ZIFFERS: Any pair of cells that are an equal distance from the central spot of a coloured ziffer line have a difference equal to the digit on that central spot.
Solution code: Row 6 from left to right
Comments
on 19. September 2025, 01:28 by KillerCard10
I loved the interaction of the two mechanics! Great puzzle.
on 18. September 2025, 18:25 by npinguy
Loved the breakin in that one column, but after that I desperately wanted this to work as a colouring puzzle and kept getting frustrated it wouldn't.
Because I forgot about the dutch flat mates. They always get me! I can never remember with them that when you get stuck, "go check in on those 5's". (and when i do, everything unblocks again)
on 18. September 2025, 14:27 by Black_Doom
Really lovely, and not too contrived at all :)
on 18. September 2025, 01:19 by softie
That was nifty.
on 17. September 2025, 22:52 by vitaminz
Really lovely break-in. I almost whoopsied by it until I saw that my starting inference absolutely had to be incorrect based on the other elements of the puzzle.
on 17. September 2025, 22:17 by sujoyku
Wonderful puzzle! Thank you, Marty!
on 17. September 2025, 11:40 by Franjo
There was only one last step that was a bit tricky for me, but all in all the path was smooth. Thank you very much for creating and sharing this lovely DFM-puzzle.
on 17. September 2025, 10:48 by mscha
Very nice interaction between the ziffers and the flat mates. The break in is very elegant, but not too difficult if you've seen ziffers before.
I ziffed through the puzzle until the endgame, where I got stuck for a while missing an obvious digit.
on 17. September 2025, 10:41 by richcard
Lovely puzzle that "zips" along nicely. Whenever I felt like I was running out of steam, there was a friendly flatmate to nudge me along again.
on 17. September 2025, 10:23 by marcmees
easy & fun. Thanks
on 17. September 2025, 10:21 by Flinty
Lovely stuff. :)
And so much easier if you don't repeatedly drift into Zipper logic and wonder why you keep breaking it - haha.
