Normal sudoku rules apply.
Dutch Whispers: Adjacent digits along orange lines must differ by at least 4.
Quadruple: Digits in the circle must appear in one of the 4 surrounding cells.
Solution code: row 9
on 14. May 2022, 12:27 by Dag H
Very nice puzzle, but quite tricky! But then I'm not very familiar with Dutch Whispers so it took me a while to figure out some (in hindsight) fairly obvious deductions.
on 14. May 2022, 07:13 by Scruffamudda
Removed superfluous rule and tag.