How do you create your own smash stage?
A. As soon as you get the game you can go to the stage builder create your own stage, save it to your sd card, and then share it on this website. If you are wondering how Salty_Water did that design, or where he got it, that I have no idea, its probably photoshopped or something. You probably could do a simple design in paint, maybe think up some classic games and create a level design.