Done. No guesses.

Done

How exciting, haven't seen a medium for a while.

art

Difficulty score 18. No green.

done

go

done

36 more puzzles to get caught up. Most are experts though!!

Done.

Go go go power gman!

23 and stuck. It's not going easily for me today.

Bummers.

Do e

Done

Well, I finally found something. It was a hypothetical virtual. Now I'm 27 and stuck.

Did it, no green, no guess. I would say that a hypothetical virtual is more difficult than a Medium trick, although once I found it, it wasn't difficult to visualize. I'm going to give that one a 50.

go

If you're wondering what a hypothetical virtual is, the argument went like this. If this cell is A that that cell must also be A. Between the two of them, they guard against A in a third block except along a line -- a virtual A. The first A and the virtual A together guard against any A in a forth block. Therefore the first cell is not A.
It's like a block pincer, except A is only partially overruled in the third block. I think it may be the first hypothetical virtual I've encountered.