tough one! got 2 categories. perhaps should accept roller coasters?

Needs to be less strict on what to accept. Got them all but didn't accept "superhero villain doctor" or "Rollercoaster" or "Shakespeare Character"

Wouldn't take doctor without 's'. I agree it shouldn't take Shakespeare character, that's far too general. Accepting the name of the play should suffice. though.

Duel is not a roller coaster so roller coasters is incorrect. Also as noted by Rickroll Shakespeare Characters is not specific enough to be correct. The key word for the doctors is Marvel not just generic superhero villain. Didn't think to put doctor as there are four so only put doctors. Maybe Aardvark needs to be more specific with the answers ;)