Logic Masters Deutschland e.V.

Although if the last ‘music sudoku ‘ that I published did not encounter many success, I propose you a new one !
Of course you do not need at all to be musician to solve this.
This puzzle is based on a french little song for children, that uses the ascending and descending C-scale, twice each*

The 4 « scales » (4 colours) each contain 7 different digits in any order, the first and the last (8th) ones are identical (darker cells)
Normal sudoku rules aplly
Normal Little killer and Arrows rules apply (see below)
Normal Thermo and palindrome rules apply, BUT with negative constraints ! If a thermo stops, the digits behind cannot be higher.
Also, there is ONE palindrome between two parallel Scales, (it is marked) and there’s no others (between two parallel scales)

Click here to play on F-puzzles

Digits along an arrow sum to the number in the arrow’s circle.
Clues outside the grid give the sum of the digits along the indicated diagonal.
Digits along thermometers must strictly increase from the bulb.
Palindrome line: The sequence of digits along a grey line must form a palindrome, so it reads the same backward and forward.

* Text of the song (sing on an ascending scale, then descending, and so on :

Do ré mi fa sol la si do
Gratte-moi la puce que j’ai dans l’dos
Si tu l’avais grattée plus tôt
Elle ne s’rait pas montée si haut
(very intellectual indeed !...)