Logic Masters Deutschland e.V.

This is a puzzle that I created as part of a Secret Santa gift this year for Calvinball, and he was kind enough to suggest that I share with all of you as well.

Ratings, comments, and feedback are much appreciated! Please feel free to reach out to me on Discord if you have any comments or questions.

Click on the puzzle image or the link below to play


Rules:
Normal sudoku, standard German and Dutch whispers, parity, odd, thermometer and quadruple rules apply.

Sudoku: Fill the grid with the digits 1-9 with no repeats in rows, columns and boxes.
German whisper (green): Adjacent digits on a line differ by at least 5.
Dutch whisper (orange): Adjacent digits on a line differ by at least 4.
Parity line (red): Adjacent digits on a line alternate between odd and even.
Odd (grey circle): Digit on a circle must be odd.
Thermometer (grey): Digits on a line must increase from the bulb end.
Quadruple: Digits in a circle must appear at least once in the surrounding 4 cells.

Solve here:
Sudokupad

Depending on solving/marking methods this puzzle will probably range from low 3 to high 4 difficulty.

Hints:

Solving without loss of generality is very useful.

There are two areas this can be used, against high/low digits and symmetry.

Consider which clues are not affected by these flips and which are.