Challenges are individual action items that you'd like your users to fulfil in the game. Challenges are categorised under Topics. For this reason, the action items introduced here should reflect the theme of the Topic at hand. Just like Topics, Challenges can be made lockable to provide your users with a guided experience. There are different types of Challenges that you could use. These include open-ended challenge, photo submissions, quiz (one-try only or repeatable), fill-in-the-blank, as well as QR code scanning.