Pop the bubbles by shooting your bubble at clusters of two or more bubbles that have the same color. When a match is made, you get an ever-increasing number of points as each bubble pops. Any bubbles, regardless of color, that are hanging off the group you destroyed will also pop. This will earn you even more points per bubble.
You can increase your score by including a bonus multiplier in the match. The multiplier is applied to the entire score from that match, including all hanging bubbles that were removed. However, multipliers that are not inside one of the matched bubbles don't count.
At intervals, the bubbles drop down one row as the ceiling descends. When a bubble reaches the bottom, the game ends. With each passing level, the ceiling drops more quickly. There is a fixed starting position in each of the first 20 levels, and thereafter you begin with three random rows of bubbles.
For really big scores, try to combine multipliers, which are multiplied together. Also, try to build large hanging groups that you later destroy. But don't get too greedy, or you won't get through the level!
Note that if you don't use the default options, your score will not be used to determine if you have mastered the game.
Bubbles stick to ceiling: Turn this off to let bubbles bounce off the ceiling.
Moving gun: Turn this on to keep the gun sliding back and forth.
Auto firing: Turn this on to make the gun fire automatically as soon as the previous shot is finished.
Random levels: Turn this on to start every level with three random rows of bubbles.
Keyboard aiming: Turn this off to use the mouse instead of the arrow keys for aiming.
Use high score eligible settings: If other options have been changed, clicking this button will restore the default settings.
Skip to level: You can enter any level number, for practice purposes only.