You must use the white ball to hit first the ball with the number and color indicated in "Target Ball" and put it into any hole or, after hiting it, put any of the other balls into any of the holes. If you do this with ball number 9, you've already won!
How to play to Ball 9
Click on the white/blue ball to place it wherever you want. Move your mouse around the white ball till you put the cue in the right position. Click (but not on the white ball) and drag the cue backwards to define cue strength, then let it go and hit.