Normal Sudoku rules apply. Digits along (fast) thermometers must increase by at least 2 at a time, starting from the bulb end. The large colored ring is made of 5 normal thermometers glued tip-to-bulb (2 in the example). Travelling clockwise around it, digits must strictly increase, with no more than 5 exceptions.
Play on Penpa
Play on f-puzzles
Play on CtC
Example:
Links to play the example puzzle: [Penpa] [f-puzzles] [CtC]
Example valid ring arrangements (ignoring the other rules):
Solution code: Row 8, Column 6
on 1. February 2024, 22:50 by Phistomefel
After solving your Border Sum Pentominous, this puzzle actually seemed quite chill. I really enjoyed finding the beautiful break-in of this puzzle and it has several very cool and clever deductions throughout the solve. Thank you for constructing this beauty, Gliperal!
on 13. March 2023, 02:38 by wisty
What a neat puzzle! Ridiculously cool opening trick finding what was initially restricted. And those fast thermos are a gift that keeps on giving to finally resolve things. Also, fjam gave me some help especially in the mid-solve - there is so much cool logic in this puzzle that I wasn't always on top of pencilmarking the ramifications of things I had figured out. Fascinating and fun from start to finish - thank you so much for sharing this!
on 18. January 2023, 21:23 by KNT
A rare puzzle where I have absolutely no idea how the creator even began to have the idea. What an insanely unique break in! (…followed by an extremely challenging thermo sudoku)
on 6. December 2022, 01:39 by OGRussHood
Ah, yes, the return of Mad King Gliperal.
on 2. September 2022, 12:08 by Gliperal
Added examples to further clarify rules (hopefully).
on 28. August 2022, 01:28 by JayForty
That was tough, but what a brilliant construction! Very original and clever, thank you Gliperal!
on 26. August 2022, 11:20 by Jesper
A very nice and challenging puzzle, thanks.