To access this feature, simply head to the Washing Machine. It can be found by taking the path to the left of the castle, in the third building you come to.
Press A to enter the building. Within the Washing Machine, enhance your past scores by beating Rabbids again!
You can either replay Chapters and Challenges. To access the Challenges part, simply press X. If you want to go back to Chapters, press X again.
Take that, Rabbids!