Example : Click this
MUGEN is a 2D fighting game engine for the PC. With it, you can create dream match-ups between almost any character. There are Capcom, SNK, Marvel, DC Superheroes, Nintendo, DBZ, other anime, and many more other characters out there.
Download the most current Windows version at: http://unofficial-winmugen.jpn.org/
Some MUGEN links for characters and stages:
Post here for your question
I've given you all the links you need to get started.
provided by-- Judge Spear's MUGEN Central
this game perfect for Cheatengine newbies to change HP and lot more