On some stages you can pop special bubbles that appear from holes in the top or/and bottom of stage. Some of them increase speed, range of bubbles' firing, others give you a chance to get more score points or extra lives. You can also pick up some bonus items to make your journey easy. After that you should jump on bubble with an enemy trapped inside and pop them! To increase your score pick up items: fruits, vegetables, diamonds, jewels etc.
Dragons can blow bubbles to catch enemies inside. In the Bubble Bobble game you play one or pair of little dragons against enemies.