The Thermo Sudoku With Only 4 Given Digits

** TODAY'S PUZZLE **
After the return of Qodec yesterday, today sees the return of Aad van de Wetering, the Dutch puzzlemaster behind our most-viewed video ever. This puzzle is a "simple" thermo sudoku but this puzzle has some seriously clever stuff going on under the bonnet.

Play the puzzle at the link below:

https://app.crackingthecryptic.com/su...

Rules:
Normal sudoku rules apply. Along thermometers, digits must increase from the bulb end.

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