The Great Divide
(Published on 8. August 2026, 14:04 by marty_sears)
Rules:
ISOFILL: Divide the grid into 10 regions, each with 10 orthogonally connected cells. Every cell in a region should contain the same digit. All of the digits 0-9 must appear in the grid.
NABNERS: No two digits on a yellow line may be the same or consecutive.
ZIPPERS: The two digits at either end of a lavender line sum to the digit on the central spot.
Solution code: Row 1 from left to right
Comments
on 23. August 2026, 12:23 by psams
Fun to solve, and always surprises me a bit how these isofill or chaos construction puzzles work out.
on 15. August 2026, 13:37 by Klausku
I love this ruleset. I wonder which other constraints would suit nicely with Isofill. Thanks for sharing.
on 13. August 2026, 01:24 by KelleyCook
I like these. Not hard, just a lot of placement.
on 11. August 2026, 16:28 by blackjackfitz
Huzzah!
on 10. August 2026, 22:41 by Djirt
Спасибо, Marty + sujoyku, прекрасная головоломка!
on 10. August 2026, 22:23 by Snaques
I feel like a total buzzkill for giving this just nice, but I just think this ruleset would work better on an 8x8 grid. There was just quite a bit of counting how far each number could reach.
Now with that out of my system, this was really fun ruleset and I did quite enjoy the puzzle. I'd go with 3*, but as Marty said it's just LMD being LMD.
Thanks for setting these up Marty!
on 10. August 2026, 16:23 by Shawn4168
Wonderful puzzle as always. But I'm with the other commenters here, I'm baffled by the 2* rating, I'd easily give this a 3 or a 4, whereas the previous puzzle was easily a 2* instead of the 3* that it got.
Marty: I am also baffled by the 2* rating, but that's LMD for you :D
on 10. August 2026, 05:23 by amchap
Wow. Found the break-in fairly quickly, but still found this a very tough solve. 4* for me. Loved it though.
on 9. August 2026, 21:55 by thoughtbyte
Brilliant fun!
on 9. August 2026, 14:46 by mscha
Whew...
Who gave this 2 stars?? 4 stars for me, closer to 5 than to 3.
I got all (I think) the major deductions pretty quickly, but still, no break-in, there seemed to be many possible ways to fulfil the requirements.
After sleeping over it, I gave it another try. I finally found something I was pretty sure about (and later found a much easier way to prove that). After that, I gradually chipped away until it was done.
Beautiful puzzle, though!
Edit: after a re-solve, I realize that it _was_ a pretty obvious thing that I missed. If I had spotted that, I could have been halfway in no time. 3 stars for me now.
on 9. August 2026, 11:57 by BigHead
Wonderful! I found it much easier after seeing Simons recent video on the other one. I thought there were some interchangeable digits after the first two thirds of the puzzle, and had to stare at it for a good ten minutes before it clicked! Other than that it was a steady march.
on 9. August 2026, 09:49 by Nairurian
Nice twist, I found it slightly harder than a 2* but that might be since I wasn’t familiar with the concept.
on 9. August 2026, 03:16 by Tortugo
Fabulous! Easier than the last isofill, perhaps because of what I learned doing that one.
on 9. August 2026, 02:34 by yuripuppies
The interactions between the isofill and the nabners are so powerful! Gave it 2*, I found it significantly easier than the previous one
on 9. August 2026, 01:01 by ScatterBrain
This was a great puzzle. I found it to be more of a 3 star puzzle. Thanks for setting!
on 8. August 2026, 23:59 by The Pi Guy
Hmm, I wonder how long it will be before Simon solves this one…?! :P
on 8. August 2026, 23:09 by polcat
Brilliant! Having never done a puzzle like this, I found it significantly harder than a typical 2*
on 8. August 2026, 22:34 by Christounet
More like these, please! Thanks :)
on 8. August 2026, 19:38 by Piatato
Neat one, thanks!
on 8. August 2026, 18:32 by Franjo
Thank you both very much for creating and sharing another lovely puzzle featuring this funny new ruleset. Wonderful stuff!
on 8. August 2026, 17:35 by Snookerfan
Very fun and approachable, thanks!
on 8. August 2026, 16:40 by bboom
Interesting puzzle, the isofill mechanic requires some different thinking, but the puzzle is quite approachable once you get your thinking straight.
on 8. August 2026, 16:38 by sujoyku
Thank you for introducing this new variant and the fun collab, Marty!
on 8. August 2026, 16:22 by philolologue
Oh, this was 24 minutes of brilliant pure fun! Always gratifying to be able to solve a Marty Sears and Sujoyku puzzle!
