Logic Masters Deutschland e.V.

This is the 8th puzzle in the Double Trouble series and finally a satisfactory implementation of one of my earliest ideas about the series.
The idea is a symmetrical arrangement of basic clues (here arrows), which becomes a unique and solvable puzzle by appropriately placed doubling cells.

More information about my Double Trouble series as well as links to the other puzzles of the series can be found below the puzzle.

Rules:

Sudoku: Fill every row, column and 3x3 box with the digits 1-9.

Arrow: On arrows the digits have to sum to the digit in the connected circle and may include repeats.

Double Trouble: Digits in cells marked with a blue diamond have the double value for arrows.

Have fun solving!

Sudoku on:
f-puzzles
(Deactivate "Highlight Conflicts" in the "Settings")
CTC-App

The Double Trouble series:
It's a simple idea. Treat a few cells as if they are double their value. But it has tons of interesting logic and can turn known rule variations completely upside down. With this series I want to show this diversity.

Variant introduction: Easy to moderately difficult puzzles that show the combination of doubling cells with different variants.
Double Trouble - Arrows
Double Trouble - Killer
Double Trouble - Skyscraper
Double Trouble - XV

Easy Double Trouble: Puzzles with easy doubling cell logic.
Doubletime

Advanced Double Trouble: The puzzles in this section present more complex logic around doubling cells.
Wrecking Ball

Puzzles with hidden doubling cells: The doubling cells are not given here, but must be determined by the solver.
Doubles Hidden Inside Squares

I look forward to any feedback and suggestions about the series.