If you're ready to help Kim protect one of her friends from a bad guy, click the Play button on the game's home screen. On the next screen, you will get to select which friend you want to help Kim protect. Your options include Ron, Rufus, Bonnie and Monique. In addition to picking who you want on your side, you also get to pick who's going to be against you. You can choose between Drakken, Shego and Dnamy. You also get to decide whether you want to be on the left or right side of the screen. Once you've made all of your selections, click the Play button at the bottom of the screen
When the game begins, you will start with the ball on your side of the screen. As you can see, your icon is stationed in front of a fairly large goal. You can use the up and down arrow keys on your keyboard to move along in front of your goal. To launch the ball into play, click your keyboard's space bar. Because there are blocks in front of you, right after you launch the ball for the first time, it's going to come back towards you. Therefore, make sure you're paying attention so you can quickly move to block it from going in your goal.
Each time the ball hits one of the blocks in the middle of the screen, that block will disappear. Once a gap is opened up, the ball will begin bouncing back and forth between you and your opponent.