MUGEN is an open-source fighting game that basically allows you to make your own Street Fighter game. You can import characters from other games to make impossible fights like you've seen in hand-made sprite hacks like Scorpion vs. Ryu. Check out our previous Mugen coverage for a video of it in action. We don't know who submitted this, but the generous hardcore gamer left this note:
This is my very first mugen creation, created from almost four months of study and difficult trial and error. I've decided to share my masterpiece with all Underground Gamer Mugen Fans:
So there you have it - Mugen Battle Zero is floating around on the internet somewhere. The best MUGEN torrent with over 800 characters appears to be active, as shown in the MUGEN video below.
That's a lot of video game fighting characters, and some funny guest appearances!
Like many independent hobby projects you're going to need to put in some time to tinker and tweak the configuration settings before MUGEN is stable for your specific system. A great resource to fix MUGEN's common problems is this forum, which has a number of utilities and stock configuration files to get the job done.
Though the game lacks polish and is incredibly unbalanced its a hell of a lot of fun! Great for a LAN party or just a bizarre spectacle on its own.