This is a small Street Fighter II Flash game which you're controlling Ryu and fighting with the Sagat from SFII. So you can't choose the fighter, can't fight different gus but gameplay is OK. You'll breathe the real SFII experience at maximum although the game is extra-limited. There's only one thing to do now: FIGHT!
Use your arrow keys for movements. "A","S","D" for punches. "Z","X","C" for kicks. You have to discover the very special movements by yourself!