In Squad Play mode, you can play Challenges hosted by others, and community-wide Squad Challenges from SuperBetter. When a Host invites you to join a Squad Challenge, you will see your invitation in the Explore section of your Discover tab. By clicking on the Challenge you can read the description and details and accept the challenge to play.
In Solo Play mode (available in Hero accounts only) you have access to a library of Solo Play Challenges with many topics and themes. In the Explore section of your Discover tab you will see suggested Challenges. You can select ‘Discover More’ to see the full library. Click a Challenge to see the description, epic win and number of Quests and Bad Guys, and an option to start the Challenge. Active Challenges are found in the Play tab of your Discover tab.