After randomly playing with my Hot Wheels Cars and Race Tracks the one day, it gave me this random idea for a Super Smash Bros Ultimate Challenge... Of course there aren't any Race Cars in Smash but I also used to use marbles on the Hot Wheels tracks when I was a kid which I created a "Marble" (aka The Smash Ball) to go down the race track which the characters must outrun it! This custom stage was created in Stage Builder!