Otherwise known as Pong.
First read all these directions.
I don't write them just for the fun of it.
After reading them, click the ping pong link above.
Then when you're ready, press the "Start Game" button.
Use your mouse (no clicking) to move your paddle.
Wave it directly over the slashes under the text area.
DO NOT click on those slashes ... just wave the mouse pointer.
Clicking will bring you someplace else ... might be interesting there too.