Region thermo lines
(Published on 4. October 2025, 19:50 by Sudokode)
For my third puzzle, I wanted to make something with lines. I had this idea of combining thermos and region sum lines and this is my second attempt at making a sudoku with this new constraint. In my opinion, the logic is not that hard and you should be able to complete the puzzle even if you’re a beginner.
Rules:
- Normal sudoku rules apply: fill each row, column and box with all digits from 1 to 9.
- Region thermo lines (light blue): 3x3 box borders divide each light blue “region thermo line” into segments with strictly increasing sums from the bulb end to the tip of the line. The position of the bulb must be determined by the solver. Example : if ‘|’ represents a region border, a valid line could be 12|4|235|39 or 456|19|31|2.
- Regular thermometer : Along a grey thermometer, digits strictly increase from the bulb to the tip.
Here is the puzzle:
Hope you enjoy it! Any feedback is highly appreciated!
Solution code: Column 1 (top to bottom, 9 digits, no spaces)
Comments
on 5. October 2025, 16:27 by Sudokode
@Exigus Glad you enjoyed!
on 5. October 2025, 15:53 by Exigus
Approachable but not trivial. Very well placed lines. Had a great time solving. Thanks!
on 5. October 2025, 15:38 by Sudokode
@ThePedallingPianist Thank you so much for solving!
on 5. October 2025, 00:34 by ThePedallingPianist
Really nice use of these lines! I had to try this as I've set puzzles with these lines before (Regionometers, Hysteria and Regional Heatwave), but mine are far more complicated so it's really nice to see such a smooth and approachable presentation here, while still retaining plenty of interesting thematic deductions :)
