You start with a number of remaining balls.
When the level starts, one ball will be on the screen. It will fall in a random direction and you will have to move the paddle to keep it from falling off the bottom of the screen. As you play, the ball will hit blocks. Some blocks can be destroyed by one hit while others take more. When all blocks that can be destroyed are gone, you will move to the next level.
If all balls on the screen fall off the bottom then you will lose one of your remaining balls and the level will reset.
During the level, a meter at the bottom of the screen will be slowly depleting. This is a bonus for finishing the level quickly. When you finish a level, you get the points for how much is left in the bonus meter.