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