If you want to make the hidden letter in the left hand column work, like on other Decoder quizzes, at "Step 3 - Quiz Design", choose "Manual", then at "Manual Design Options" use "Answer Component (hidden)".
Just missed Solo and Lowbacca. But honestly, I'm GLAD that I missed Lowbacca (he was in the Christmas special, right? I wouldn't know because I've never sen it ((thank goodness)).).
The Holiday special had Chewies son ...Lumpy... as well as Itchy his dad and Mallatobuck his wife....Lowbacca was in the expanded universe books and studied at Luke's Jedi academy.