I've done many of the puzzles in that book. It's not entirely clear to me how you assess difficulty level (may have something to do with the number of steps your solver takes), but it seems to me that some of the Tricky puzzles are more difficult than the Difficult ones (that earn points). I don't really have any wishes, except that you do indeed publish another Killer Sudoku book!
I didn't even attempt it until I had learned how to to the difficult ones on this site.
For whatever reason, I found the very last puzzle in the book to be extremely challenging. If all the puzzles had been as challenging as the final puzzle was, it would have put me off doing books.
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