Remix and add more characters. To add a character, duplicate a player sprite and change the name (in the pink block), costume, and if you want, voices. Change the sprite name too or else the project will break and their medal will hang out at the center of the screen instead of floating above your character. Random Tip: Hover over a character to see their name and the lap that they are currently taking.
Credits: @RDash75 for the kart sprite that I edited to make look like MKDS Nintendo for Waluigi Pinball, Waluigi, and the music Scratch Team for Scratch