go into the sprite editor (load the correct sprite sheet as necessary. goto the sprites that have the black outline (test all characters so that you can see what frames/sprites of their animations need to be fixed) once you have found the sprites that need to be fixed, choose the black color that looks like it has a white crossout over it. that color is clear. now, can i playtest the game for you?
if i playtest it, i can help you point out issues and bugs/glitches. i will report the said issues to this very post and then, once fixed, hopefully, get ahold of the game after the issue(s) were fixed so that the game will be ready for release. thanks.
There, Snookems. I fixed some sprites.
Snookems... I don't think I'm gonna release SMM... at least not soon.
@GRAND DAD There are no glitches in this game... like NONE. The only problem is without the New3ds it runs really slow.