Welcome to the "world of killers"...
I guess the rating of "Deadly" in the Times puzzles is equivalent to BRAIN/IQ in our side of the world... The next level above is called "INSANE", and the highest level as of now is "RUUDICULOUS" (named after a certain "insane puzzle creator")...
I wouldn't dare to show you such a puzzle as it would probably scare you away from that side of world for good...