Not bad
It's kind of like the Impossible quiz, but not quite as funny, which is a shame, to be honest.
I think that you need to work a little on some of the solutions, since things like "Dark Side of the Moon" is a little anal to accept it for the medal, but not accept it as the level completion answer. After all, people can still relate to the album title, even by calling it just "dark side", but hey.
I had a little trouble solving some of the levels, particularly 32 and 41, since they seem to have no way of showing you where the codes are - thanks to people for lending me the results via reviews :P You can be a complete bastard with Level 48, sending you back to the beginning. Perhaps you need to consider making this whole piece an amalgamation of the first three (or four) parts, to give a load of questions that could fit together well. After all, Impossible Quiz had loads of questions that fir together, where yours only has 20 questions, which leaves me feeling a little iffy regarding this.
[Review Request Club]