Shooting is done with right clicking the mouse to fire at fractions that are equivalent to the displayed percent. Hitting an equivalent fraction with the right click missile is worth 30 points. Right clicking and hitting a fraction that is not equivalent to the percent is worth -5 points. Left clicking and hitting a fraction that is not equivalent to the displayed percent is worth 2 points. Left clicking and hitting a fraction that is equivalent to the displayed percent is worth -15 points. The fraction bubbles are random and usually switch half way through the 30 second level. There are 20 levels with a 30 second time limit for scoring. Each new level brings a different displayed percent.