huh?

Too hard for me, lord charles. The groups are obscure.

I'll grant you one obscure category, Pantac, but on the scale of this site, it doesn't seem so bad. Still finding my way as a gridwright.

I'm with Pantac here. I dig the effort and there's definitely nothing structurally wrong, but I do think it's one of the hardest puzzles on the site and a couple of the groups are very nearly impossible. If you think it was reasonable, I'm guessing you do extremely well at trivia. :)