Players need to choose a suitable timing and launch at an appropriate angle. It is also necessary to make full use of the characteristics of various mechanisms in the level, and use as few bullets as possible to break all balloons, in order to obtain higher star counts.. The first 20 levels are introductory levels designed to familiarize players with the characteristics of each bullet. In the following levels, players need to choose two types of bullets based on their characteristics to bring into the level, and the two types of bullets need to cooperate with each other to clear the level