The goal is to destroy the balls until all duplicate balls have disappeared.
Shoot the ball by pressing the arrow keys then pressing the Enter key
to shoot it. You can bounce the balls off the top wall to shoot a column.
When you shoot a set of the same coloured balls then the ball behind
that set changes to the same colour. The next ball to be shot is the
same colour as the ball that has changed colour.
Click on the "X" to start and also to see the playing instructions.
After pressing the "X" you use the keyboard arrow keys and
the Enter key.
After completing a level, press ">" to move to the next