Players take turns launching balls from the left side. The goal is to have the ball go though the opening in the barrier and hit one of the green areas, in which case the player is awarded the indicated points. If the ball comes to rest on one of the yellow penalty areas, 2 points are subtracted from the score.
To launch a ball, choose a height from 0 to 100 and press ENTER. Choose a speed from 0 to 100 and press ENTER. Then choose a bounce coefficient from .10 to .90 and press ENTER. The ball will now be launched.
(The bounce coefficient is the height of the ball after a bounce divided by the height of the ball before the bounce. So a ball with coefficient of .2 or .3 will hardly bounce at all, whereas a ball with a coefficient of .8 or .9 will be very lively.)
After both players, taking turns, have launched 5 balls each, click on the "Next Round" button. A new barrier will be drawn, and each player will get 5 more balls.
Continue new rounds until a player wins the game by achieving 50 points.