I know its pedantic, BUT…

…the capital of Brazil is Brasília, not Rio! Pleeeaaase somebody correct the description of the quiz-tag generator.

Sorry, but I had to create a couple of quizzes and was forced to read that help-line one to often. ?? ??

For the Rest:
Plugin works as intended, is easy to use and even accepts values per GET-Variable – well done, thank you!
Only thing I am missing a bit is a good spam-protection alternative to reCaptcha (that would be the fifth star).