Haisudoku Thermoline (Thermo Sudoku+Haisu hybrid)
(Published on 15. November 2022, 03:02 by AnalyticalNinja )
***a NinjaRat Production***
By rockratzero and AnalyticalNinja
Rules:
Normal sudoku rules apply:
Place the digits 1-9 once each into every row, column, and 3x3 box.
Haisu rules apply:
Draw a path through the centers of cells, starting at green and ending at red, that passes through all white cells without intersecting. The path can only move horizontally or vertically (not diagonally), and does not enter any grey cells. Caged digits of value N indicate that the path passes through that cell on its Nth visit to the 3x3 box that cell is in.
Thermos:
The line segments within each 3x3 box count as thermos, and digits strictly increase from the green end. Each time a line passes through a box is treated as its own thermo.
Playable with Penpa+ (answer check on numbers and lines) or CTC (answer check on numbers only).
Solution code: Row 1 followed by column 2 of the solution.
Comments
on 26. September 2025, 19:04 by glum_hippo
That is more fun than any puzzle I've done in a very long time, with beautiful deductions everywhere — as long as one asks the right questions.
on 24. September 2025, 21:16 by asimov.io
Very cool idea and execution
on 22. September 2025, 16:32 by Agent
Great puzzle, and not too hard with a bit of theory!
on 17. December 2022, 17:19 by Niverio
Excellent puzzle! Lots of satisfying yet tricky deductions in this.
- Thanks so much! I'm really glad you enjoyed the deductions in it, and I greatly appreciate the feedback! :)
on 17. November 2022, 09:29 by kjholt
Wonderful puzzle! Probably 5* difficulty for me but that's because I don't have any experience with Haisu puzzles.
- Thanks so much for giving it a go! I'm really glad you enjoyed it, even with the added difficulty from unfamiliarity. I really appreciate the feedback!
on 15. November 2022, 20:39 by lerroyy
Very nice puzzle and use of the haisu rule! thanks
- Thanks! I'm really glad you enjoyed the puzzle!
on 15. November 2022, 12:37 by AnalyticalNinja
Updated difficulty to reflect feedback.
on 15. November 2022, 08:51 by Ambrose
Excellent puzzle, really well crafted!
- Thank you! I'm flattered by your words, and I will pass them along to rockratzero as well. ^_^
on 15. November 2022, 05:25 by Samish
Great puzzle ! This hybrid works really well and the puzzle is quite fun and clever :D Enjoyed it a lot!
- Thank you so much! I'm so glad you enjoyed it, and I really appreciate the feedback! <3
