Three y's? That seems a bit excessive. Maybe loosen up the spelling a bit on that one. Tatooine. Endor. Dantooine. You could put all those on here and a few more and still have a managable quiz size.
Geonosis is the planet from Attack of the Clones with the giant battle. My first thought after completing the quiz is that it should have been on here.
I made a somewhat longer version of this quiz, which includes more planets not only from the original and prequel trilogies, but planets from the Disney-era films as well.
question 6 is wrong, endor isn't the planet, endor is the moon. i keep seeing questions asking for the name of the planet but the answer turns out to be endor
Dune?
I kid because I love (and because I'm bitter I only got six of them)