Regional Heatwave
(Published on 24. February 2025, 21:52 by ThePedallingPianist)
Normal sudoku rules apply.
Classic fog of war:
- Some of the grid is covered in fog;
- Entering a correct digit will clear all fog in that digits immediate neighbourhood.
Regionometers:
- Box borders divide lines into segments, whose sums must strictly increase from one end to the other;
- No line has multiple segments in the same box;
- Different lines are different colours;
- Lines may not branch or share cells with other lines;
- Lines may cross diagonally at cell vertices.
N.B. Lines have been made thin enough such that it is not possible to assume that diagonal line segments do or do not exist based on a few pixels of colour in the corner of a non-fogged cell (e.g. r5c1-r6c2 may be a line segment even though it doesn't appear in the top corner of r6c1).
Solution code: Row 9 (bottom row), left to right
Comments
on 27. June 2025, 04:43 by Agent
Very cool puzzle!
on 17. March 2025, 04:42 by TheNineElements
Solve Time: 25:46
I rated this 2/5 difficulty.
Really great FoW puzzle! I really liked how the solve path was clearly well thought-out & planned, and how the puzzle really utilized every aspect of the rule, right up until the very end.
This puzzle was very smooth from start to finish, and was honestly quite approachable while remaining very engaging. I think the overall difficulty was on the harder end of 2*, but not quite at the 3* difficulty level. Every step was totally fair, and my solve time also falls in the range of other 2* puzzles.
Great puzzle, thanks for sharing!
on 13. March 2025, 12:01 by AryaSV
Very nice puzzle, I always forget to never write a number in a fog sudoku even to visualize the next few steps' working. I did that by mistake in one cell, which gave me some info that I didn't earn properly. But I refused to use that info until I derived with proper logic again.
Enjoyed the puzzle thoroughly nevertheless
on 3. March 2025, 18:53 by AshBrown
Loved this. Got stuck because i drew my own lines and made a horrible assumption.
on 26. February 2025, 01:03 by PancakePie
Fun! It definitely stretched my mind for what was hiding back there behind the fog. Beautiful work!
on 25. February 2025, 23:22 by novato
Super fun to solve, quite approachable in the end but certainly not easy. Everything flowed really well.
on 25. February 2025, 15:23 by Franjo
Amazing puzzle with a beautiful break-in! And surprisingly approachable - especially for a TPP-puzzle… :-)
Thank you very much for creating and sharing this lovely gem.
on 25. February 2025, 13:52 by DonQuichopp
I am afraid I don't fully understand 1 part of the rules: what does strictly increase mean? 1<2<3 or 1<5<9?
on 25. February 2025, 12:13 by VitP
for any "noobs" reading this:
ignore the stated difficulty. it's wrong. this puzzle is "approachable", and worthy.
all you need is
- basic sudoku (there is a "pivot", but you can find that without knowing what it is)
- understanding the concept of >
- ability to add small numbers
- knowing basic cage combinations
- basic logic
on 25. February 2025, 10:20 by 9Rookienumbers
Amazing construction, challenging but smooth, thank you for this gem!
on 25. February 2025, 09:06 by rubencubed
very natural solve! I especially liked how the final line serves only to remove equality as an option
on 25. February 2025, 04:44 by therealsillypenguin
What a great puzzle! Had a very smooth beginning with a tricky middle section. Thanks for sharing!
on 25. February 2025, 02:17 by softie
What a puzzle! After the first 5 minutes I thought I'd just whip through this and then it took me through a 3* roller coaster. I loved the final disambiguation!
on 25. February 2025, 01:21 by ThePedallingPianist
Links to more Regionometer puzzles
on 25. February 2025, 00:19 by ViKingPrime
What a phenomenal puzzle. This has such a casual brilliance to it, the kind of puzzle that feels like it coalesced fully formed out of the ether... almost (or maybe completely?) divine.
on 24. February 2025, 22:16 by Fizz
Very cool and fun puzzle, thanks!
on 24. February 2025, 21:55 by arctan
lovely geometry, always enjoy when things fall into place just perfectly so, and absolutely loved the finish on this
