To move the left paddle, use W and S keys. For the right one, use the up and down arrow keys. To score, you must get the ball to hit the wall behind your opponent's paddle. The first person to 5 points wins.
My older sister gave me some help and lots of encouragement for this game. And, of course, I need to credit the original pong game from whatever decade it is from (70s? 80s?).