3 questions

[alex_mugen]

I want to know how to add extra games to MUGEN,like the first stage of Super Mario Brothers,so if you guys can just help me on that.
Secondly, I want to know how to add endings to characters.
Lastly,I want to know how to add an intro video to MUGEN.
Thanks in advance !!

[Fallen_Angel]

the mario bros stage, you add it as a char, and use the stage that cames with it

For endings just add them in the .def of the char

[Acey]

and #3, you can;t just add any video as an intro to Mugen, it has to be a file made specifically to be a game intro for Mugen. When you have an intro (includes intro.def and intro.sff) all you do is put those files in your mugen/data/ folder.