The goal of the game is  "to kill" the other player's ball.
There can be only 2 players. Each player chooses his/her ball.
The "controllable balls" are  green and cyan in color. Balls
can be caused to increase/decrease their speed , rotate
clockwise and counterclockwise by 45 degrees and shoot. A ball shoots
in the direction of its movement. The faster it moves the longer
it shoots. There is also one more limitation. A ball may shoot
only twice between that ball's two consecutive collisions against walls.
The number of remaining shots is shown in the center of a ball.
After a ball is killed it can be activated by pressing on the space bar.
(Pressing on the space bar accelerates all the balls to maximal speed.)
On the right side you can see the score. It can always be reset
to 0:0 by pressing on the "reset" button. The number of
yellow "disturbing" balls can be controlled from the text field
under the text "Yellow balls N". This number cannot be greater
than 9.
The table of controls:

Yellow balls just disturb colliding. They are not controlled and
cannot be "killed".
ENJOY THE GAME!!!!!