Missions is a feature that will allow you to earn Ranking points and claim a prize chest by completing tasks in different game modes. To access it, you will have to enter the games module, located on the second icon of the lower options bar at the bottom of your home screen.
Once you enter, you will see your assigned tasks along with the Ranking points you will receive when you complete each one of them. At the top of the screen, you will find a bar that will fill up as you complete your missions.
When you complete a task, you will have to go into the Missions section to collect your rewards. You will have 96 hours to complete all 5 tasks and claim a prize chest of coins, credits and right answers.
Additionally, you will be able to get extra missions by watching an advertisement video or paying a cost in credits.