Topics are themed questions squares that you will find both in Mountain Track as in Toad Kingdom. They will be represented by a question mark (?) and will be purple.
As soon as you land on a Topics square, you can choose between three different topics. In case the topics are not to your liking and you want to answer a question on another topic, you will have the possibility to watch a video to receive 3 new categories or pay 30 coins to answer on a specific topic.
Answering questions on specific topics will allow you to complete the new Themed Missions. Each time you correctly answer a question on a new topic, a progress bar will appear; upon completion you will receive a collectible Frame or Pawn as a reward. In the "Missions" section, you will find the "Themed" tab, in which you can see the Missions you have in progress, and what you need to complete them.
Both the Frames and the Pawns can be equipped to use in your profile picture, or as a character to use on the different boards. You will be able to find the Pawns and Frames obtained at the moment in the Inventory that you will find represented by a backpack icon in the bottom bar of the game.