Logic Masters Deutschland e.V.

This is the 3 puzzle using the same basic idea.
Originally I noted that I could force the desired restriction with Killer Cages or Remban Lines.
At the time I thought that German Whispers didn't work because it could not impose the same restriction
but I decided to explore what restriction could be imposed.


Normal sudoku rules apply.
Every row, column, and 3x3 box must contain all digits from 1 to 9.
German Whispers rules apply.
Digits along green lines have a minimum difference of 5.
Arrow rule applies.
Digits along an arrow must sum to the digit in that arrow's circle.
Digits may repeat along these arrows if allowed by the other rules.
Note: The arrow starting in R2C8 is: R2C8=R3C7+R4C6 (looks clearer in CTC)

Link to play: F-Puzzles, CTC