Someone on the Facebook John Carter Sequel Group found this Edgar Rice Burroughs Trivia game which is pretty fun stuff. I took the one for A Princess of Mars and aced it! (Thank God). If you take it, keep in mind you get points for how quickly you find the right answer. In truth, for the A Princess of Mars quiz, there were 10 questions and only about 3 that anyone who read the book and paid attention might miss. However, there are other games for the different books in the Martian series, and Tarzan — good stuff.