You can access this game mode from the "Play" button on the main screen and then "Mountain Track". Once you do so, a new pop-up window will open, from which you can choose your opponent and start the game.
This board represents the default game mode, and the rules are simple: rescue all six characters and reach the top to claim victory before your opponent.
As you progress, you will notice that there are certain squares marked with a symbol from the six question categories, which represent a character's square and act as mandatory stops on the board. You will need to answer a question from the category corresponding to the character you encounter in order to progress.
If you fail to answer correctly, you will lose your turn and will not be able to move forward until you answer the character's question correctly.
If you rescue all six characters and reach the finish line before your opponent, you will be the winner.
Additionally, you will find purple squares with a question mark in them, and if you land on one of them, you can choose from a number of special topics to answer. If you answer correctly, a new Themed Mission will be unlocked, allowing you to obtain collectibles from the chosen topic.