Mario and Luigi race through a Mario-themed go-kart track and compete in a marble maze to determine who is the best brother. They reconcile their sibling rivalry and work together to rescue Toad and the princess from Bowser.
Here are the key facts extracted from the text:
1. Mario and Luigi are attempting to rescue Princess.
2. They encounter obstacles like Bullet Bill and jumps.
3. Mario and Luigi engage in a friendly rivalry and competitions.
4. They have a Mario Kart racing track and marble maze for contests.
5. Mario wins the Mario Kart race, while Luigi wins the marble maze.
6. There's a debate about who should get a power-up.
7. Bowser captures Toad and the princess, forcing Mario and Luigi to work together.
8. Eventually, they reconcile and become friends again.
These facts summarize the main events and actions in the text without including opinions or subjective statements.