Do as many points as you can batting both in the Minor Leagues as in the Major Leagues. In the Minor League mode it's easier to play but the batter has less power and less swing control.
Arrow keys left/right to move the batter and place him where you want. To hit the ball, place the mouse pointer close to the batter's feet and when the ball is coming move the mouse quickly to the up; the strength of the hit will depend on the speed of its movement at the moment when the bat and the ball make contact. For a better result, you have to hit the ball with the head of the bat. At every moment, a white sign will show you the point where the bat would be sending the ball if the hit is straight; a little movement to the left or to the right will have a similar effect on the movement of the ball.