#3 - All or Nothing Killer Sudoku

 All or Nothing Killer Sudoku

Standard Sudoku rules apply.
Killer Sudoku rules apply: in every cage with a dashed outline, all digits are different and the number that may be written in the top left corner is the sum of all digits in the cage.
When the sum is written with two different digits, either both digits are in the cage or none of them are. This applies even to cages whose sum is not specified.

 

This variant was invented by Erwan Bernard.

Penpa link to solve online: https://git.io/JlJwm

This puzzle was solved by Simon Anthony on Cracking the Cryptic: https://www.youtube.com/watch?v=uVYG5Jica1I