Rules:
Normal Sudoku rules apply.
Digits in a cage must add up to the total shown in the top left corner. Digits may not repeat within a cage.
Additionally, a 27 cell long slow thermometer must appear in the grid. The thermometer may only travel between cells that touch on a side or a corner. Digits may repeat along the thermometer, the thermometer may not branch, and the thermometer may cross itself as long as it does not use the same cell more than once.
F-puzzles linkSolution code: Columns 1 and 2 (18 digits)
on 28. December 2020, 16:46 by Fedo
Wow that was nice! After you find the thermometer is pretty straightforward, but it is not immediate to spot it. Thanks for this!