VRChat is a very cool, free massively multiplayer online virtual reality social platform application (not just a game) developed by Graham Gaylor and Jesse Joudrey using Unity in 2014. If you think of VRChat as a pure game, then its gameplay is somewhat similar to that of Second Life and Habbo. In this VR world, every player can create his/her favorite world, room and character, incarnate into any figure he/she likes, and freely communicate and interact with strangers all over the world!

First, you should know what M.U.G.E.N is. M.U.G.E.N is a free, non-professional 2D fighting game engine that only made for personal use on DOS, Windows and Linux platforms. Its was developed by Elecbyte group using the C language and Allegro libraries, and gives the characters from different ACG (Animation, Comic, Game) a common platform to fight with each other.