Killer Samurai Sudoku

Volume 6 of the series of books with the most difficult variant of Sudoku... Killer Samurai Sudoku!
Again in this volume, there are:

• 75 Killer Samurai Sudoku
• 25 Jigsaw Samurai Sudoku

That should be easy enough to comprehend. But what about the puzzles? They are surely not easy!
These puzzles come from Djape, the author of Sunday's Samurai Sudoku for The Washington Post.