Riddle Books and the Teacher Copilot are completely free, and will work on any recent web browser. Any class with access to a PC, Mac or Chromebook can participate in the challenge. We are working on iPad support but it won’t be available for this particular challenge. You’ll also want to make sure you have Flash Player 11 (or greater).

Head the home page, read about Riddle Books, check out Common Core compatibility with our sample problem types, or dive in to start getting organized for your challenge week!

Sign Up Now! Sign In With My account!