Logic Masters Deutschland e.V.

Normal Sudoku rules apply. Each coloured region is a killer cage i.e. the number given in the top left is the sum of the digits in the killer cage. Digits do not repeat in a killer cage.

Additionally, each killer cage could act as a thermometer, that is there is a path within each cage that is strictly increasing. For example, a cage of three with 1-3-9 is valid, but 1-9-3 is not. In the case of 2x2 boxes, this picture illustrates the rules.

This is part of a group of "Thermal Killer" sudokus. There are 3 different puzzles, and a bonus puzzle which requires the solutions of the 3 puzzles. This was inspired by Eggr's Hidden Clone series

This is, in my opinion, the hardest of the three thermal killer sudokus.

Links: Part 1 Part 2 Part 3 Bonus