I thought last Friday's (12th March 2021) difficult Killer Sudoku was easier than usual, it seemed like a good example of how adding cages can be a big help when solving this type of puzzle so I made a youtube video.
It shows solving the puzzle from start to finish and it is about 17 minutes long. My previous video just had background music, this time I have described what I am doing at each step.
If you have been finding the difficult Killer Sudoku puzzles a bit tricky or if you have been using trial and error to solve them you might find my video interesting, and you might be surprised how few pencil marks are required.
https://youtu.be/L8DuIajRc5c