In Street Fighter II you play as Ryu and go against a wide range of fighters. It's your job to defeat them all to beat the game. To do this you will need to know a few very important things. To move Ryu around use the directional arrows. To perform attacks you will use D, A and S to punch. Pressing the down button will cause you to perform a ducking/block move. To kick press Z, X, and C. The more you attack the more health your opponent loses. The more powerful the attack is the stronger it will hit so try performing combo moves as well.