If you drop a ball you lose points and take a step towards losing the game. If you get ’em past the computer-controlled paddle you win points and get to play for longer. 

It’s simple and fun and only marred by the eternal problem with Flash games: if, in your excitement, you mouse off the playing area you lose control and generally lose the game.

Play Pwong here: http://www.jgames.ch/jgames/play.php?id=204