maybe each elimination has a totally different quiz.
maybe the quizzes are like those facebook quizzes like "Which harry potter character are you MOST like" types of quizzes.
or ESTP type of quizes, of like the quiz from Ultima IV
whatever....
but if each quiz was different maybe you would not figure out who it was that way.
Was it easy to figure out who the mole was here?
It seemed easy enough on the show.
Some of the challenges on the show were so bad :P