Logic Masters Deutschland e.V.

The last days have been quite tiring for me so I wanted to do something to cheer myself up a bit before the big things in the future, and then I revisited my upcoming puzzle plans. However, the first plan hasn't gone so well and there are so much issues involved so clearly I need more time to polish and complete it. For the second one... well...

For this one, I revisited my good old arrow variant and decided to play around and then I actually discovered some funny tricks, which lead to this cool result. The puzzle shouldn't be so challenging, but let's see how it goes:



Rules:

- Normal Sudoku rules apply: every row, column and 3x3 box contains digits from 1 to 9 each once.

- Digits along an arrow must sum to the digit in the circle cell attached to that arrow. Digits along an arrow can repeat if allowed by other rules.

- Letters A,B,C,D are mysterious digits that need to be deduced (note that it's possible that some of the letters may represent the same digit).

- A circle surrounded by four cells is a quadruple clue, i.e digits represented by letters in a circle surrounded by four cells must appear in those four cells.

Puzzle:

F-puzzle link

Penpa plus (alt. link)

CTC app (alt. link)

Good luck and have fun solving!