Use your arrow keys to aim and shoot the
bubbles. The "UP" arrow key is your "FIRE" key. You advance
to the next level by 'popping' all the bubbles. Connecting 3 or more bubbles
will pop them. When the bubbles pop, all the bubble 'below' them will also fall.
But don't take too long ... each level has a time limit. Practice on the first
couple screens and you'll learn how to develop strategies for winning! For
example, try ricocheting (bouncing) the bubbles off the walls.
Note: to start the game, you might have to
first click on the game with your mouse, and THEN hit the FIRE key (UP arrow).