Who said Shakespeare quizzes?

While Googling around for shakespeare trivia I ran into the mother of all Shakespeare quiz repositories. They're categorized by play (three quizzes on Titus Andronicus alone??) and difficulty.

I'm working my way through the "tough" ones. Getting about a 7 or 8 out of 10 on average.

Weird - attempting to identify the play in which a dying character says "A plague on both your houses", which obviously we all know to be Mercutio in Romeo and Juliet, I ended up getting it wrong because I typed "Merchant of Venice." I totally don't remember doing so. My only guess is that I started typing "Mercutio", but my fingers knew that the category was plays, not characters, and ended up filling in the name of a play that started with Mer. I hate when that happens.