14 Sequence Thermometers
(Published on 25. August 2026, 08:46 by varepsilon)
Normal Sudoku rules apply: Place the digits 1–9 exactly once in every row, column, and 3×3 box.
Sequence Thermometers: Digits along each thermometer increase in equal steps from bulb to tip, forming a strictly increasing arithmetic sequence.
The 14 thermometers form seven pairs. Within each pair, the thermometers have identical shapes and bulb-to-tip directions—in other words, one can be translated onto the other without rotation or reflection.
The two thermometers in a pair have the same common difference; different pairs have different common differences.
Solution code: Digits in row 5, read from left to right.
Comments
on 28. August 2026, 16:20 by Gem024
Took me a second to fully grasp the rules but solved easy and nicely once I got there.
on 26. August 2026, 15:23 by faltenin
Loved it !
on 25. August 2026, 22:17 by barnacle
Fun rules! Same as alarark50, had to sit with it a moment, but once it got going it went nice and quick!
on 25. August 2026, 20:14 by YoooDeej
Very enjoyable, thank you!
on 25. August 2026, 19:50 by alarark50
this was one of the most enjoyable puzzles i solved for a while :) Initially I was staring at the puzzle without a clue and was going to skip, but when I realized it I was blown away! it was very smooth after that. The initial idea feels closer to a 2* on my end.
on 25. August 2026, 18:53 by balpha
This was fun, thanks for sharing! I loved the little extra credit task in the solution message :D
on 25. August 2026, 10:07 by Myfyr MJ
A very nice and easy puzzle. Much easier than it appears.
