Super EXest PZest. I had it half done after my first pass of hit-or-miss crosshatch searches and completed before my numerical order inspection was half finished. I'll give it a 4. I'll bet Dr Who's score doesn't even go that low.
That word was supposed to be EZest.
Difficulty score 15. I have generated puzzled that get scored as low as 3. That is the lowest score I have seen out of my scoring algorithm. It is not hard to devise a puzzle that scores a 1 or a 2, but it would be a trivial puzzle with way more clues than the ordinary puzzle.