Fisher-Price introduced a number of tot-friendly iPad accessories and cases for various age groups, but the most interesting by far is the Imaginext Apptivity Fortress ($40, available Fall 2013). A combination app and toy, the Fortress case (complete with an attached cannon and sentry points) serves as an interactive backdrop to the app that loads different games depending on which character you're using. Tots interact with onscreen characters — a knight or a troll — and fend off trolls. They can even be knighted throughout the games. By using the iPad's camera, other toys (and friends) in the room become the backdrop for your adventure.