The 2-player version of this game can be found here.

Game notes: When the ball is hit, the function whose path it is on will be
momentarily highlighted. You cannot change your function choice while
your function is highlighted.
You can pause the game by moving the mouse pointer away from the screen.

The first player to 1000 points wins. You get 10 points for hitting the ball and
50 for getting it past your opponent.

By the way, do not "rush" toward the ball. Your paddle takes large steps, so
you might end up jumping right over it!!!