Here's a flash game based on the 2D fighting game of Hokuto No Ken:
http://flashkof.fr/hokuto/game.html
It's pretty ambitious, it uses sprites from the arcade game, the Animetal version of "Ai Wo Torimodose!", and you can set your own key controls and options like difficulty and the basics for any fighting game.
I can't get it to do anything other than show Kenshiro and Mr Heart standing opposite each other - not fighting. I press lots of buttons... nothing.
Other people seem to be able to play it just fine, though. So I'm posting the link.