Hankering for some old-school Hadokening? Check out the official flash version of Capcom's classic Street Fighter II!
Not much to say about this one, really.
Well, to be precise, it's Street Fighter II: Championship Edition. That's the one with the four playable members of Shadoloo - Balrog, Vega, Sagat, and M. Bison. It's a completely faithful recreation of the groundbreaking grandfather of the modern fighting game, from the sound effects ("Hadoken!" "Sonic Boom!" "Uohohhhohohohoohh!") (That would be someone getting K.O.'d, of course) to the inputs.
Of course, playing with a keyboard is a bit different than doing it with a gamepad. I can't imagine how the hell you'd try to do Zangief's 360-degree inputs.
But that's okay. It's Street Fighter II, man. What more do you want?