Just press the green flag! The paddle will follow your mouse. Don't let the ball touch the water (the blue) Note:Don't worry if you can't get the ball on your first try because it comes down too fast. Happens to me all the time.
Thanks to Lolipopcorn's Pong (Original) for inspiration and to Scratch tutor for telling me how to stop the game. High score by MrMonkeyProductions-135! Thanks to all of you who commented or loved or favorited.