I don't understand...are you supposed to type them in a certain order? I typed Road Runner, Daffy Duck, Pinky and the Brain, Betty Boop, Scooby-Doo, Casper, Tazmanian Devil, Arnold, Snoopy, Bullwinkle and none of them worked. The only three I was able to register was Mickey, Bart, and Fred. There seems to be either an error in how the quiz was put together, or in how it is explained to the quiz taker.
Fun quiz, only missed Dexter who I dont even recognize after knowing the answer. One thing though, "Felix the Cat" remains black after entering correctly.