To see if you have what it takes to rack up a high score playing Pacman, press Start Game in the middle of the screen. Once the game begins, you can control where Pacman goes by using the arrow keys on your keyboard. Your score is on the bottom left of the screen. As you play, you will see that your score increases each time you eat one of the dots. While eating these dots is easy to do at first, it gets more difficult as the ghosts begin to make their way around the screen.
Next to your score, you will also see how many lives you have left. To avoid losing lives, you have to stay away from the ghosts. The only exception to this rule is when you eat one of the flashing dots on the screen. When you do this, the ghosts will temporarily be rendered defenseless, and you will have the opportunity to eat them. However, because there are only a few flashing dots on the screen, you have to be strategic about when you eat them. If you eat them all at once, you're going to have a much harder time completing the level.
As you're playing the game, if you need to stop it for a minute, you can pause the game by pressing P on your keyboard. Keep in mind that you can also shortcut your way around the screen. This is done by guiding Pacman to the open ends of the screen. When you go through this area, you will come out on the other side of the screen.