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(Published on 27. August 2026, 02:21 by marty_sears)
Rules:
ISOFILL: Divide the grid into 9 regions, each with 9 orthogonally connected cells. Every cell in a region must contain the same digit. All of the digits 1-9 must appear in the grid.
ENTROPIC LINES: Each peach line must contain one low digit (1, 2 or 3), one medium digit (4, 5 or 6) and one high digit (7, 8 or 9.)
THERMOMETERS: Digits along a thermometer must keep increasing as they move from bulb to tip.
Solution code: Column 8 reading downwards
Comments
on 14. September 2026, 17:35 by samwdc
Loved it <3
on 31. August 2026, 19:33 by pmays123
I had a lovely time solving. Thanks for sharing!
on 28. August 2026, 21:22 by daggerMason
+1 for Marty’s a genius.
on 28. August 2026, 19:07 by emoney1374
Fun puzzle!
on 28. August 2026, 13:42 by ragakeet
Simply gorgeous. Isofill is quickly becoming a favourite ruleset of mine!
on 28. August 2026, 02:27 by eladv
The hardest part of this was remembering that each region has 9 cells, not 10. (I got this wrong for quite a while!) After that, perfect puzzle, just a beautiful flow.
on 27. August 2026, 20:23 by kasperd
The easy side of two star puzzles.
on 27. August 2026, 20:07 by Klausku
At last, thermos & Isofill. And what a brilliant and not too difficult setting. Loved it. Thanks, Marty.
on 27. August 2026, 18:32 by KeenanN
Mindbogglingly beautiful. I really loved this one. Very straightforward for me, almost like the puzzle was solving itself. Thank you! :)
on 27. August 2026, 15:53 by Arheus
Just genius. How do you come up with this stuff? Amazing that this has a unique (and smooth!) solve. Kudos!
on 27. August 2026, 14:47 by blackjackfitz
Huzzah!
on 27. August 2026, 14:36 by Visumation
Really cool. Thanks
on 27. August 2026, 13:06 by mscha
Very nice!
It took a minute to sink in that this is not a 0-9 isofill. :-)
I love how these constraint types that we all know so well have a very different effect on isofill than on sudoku.
Difficulty for me is a high 2 stars.
on 27. August 2026, 11:53 by Franjo
Thank you very much for creating and sharing another beautiful Isofill puzzle.
on 27. August 2026, 11:23 by GeorgeTheToad2
Great stuff
on 27. August 2026, 11:12 by Storf
First puzzle from Marty Sears that i was able to solve, very cool, very enjoyable, time spent well.
Although, surprisingly, this puzzle was easier than usual. But it's better this way, we dummies should have some enjoyment too.
on 27. August 2026, 06:42 by richcard
Beautiful stuff.
on 27. August 2026, 06:40 by Silverscree
Isofill is proving very fun, I look forward to more!
on 27. August 2026, 04:14 by Thanos13
Marty never disappoints!
on 27. August 2026, 03:57 by KelleyCook
Another great Marty puzzle. Maybe I'm getting used to isofills, but I found it the easiest of the series so far.
