Bubble Bobble tells the story of Bub and Bob, two humans who wander into a mysterious monster cave and are magically transformed into dragons. To return to their human form, they must reach the end of the cave. The game is a platform adventure where each level takes place on a single screen. The goal is to defeat all enemies by trapping them in bubbles and then popping them to turn them into fruit. Bubbles can also act as platforms, while power-ups such as lightning or water currents help clear enemies more quickly. Collectible items like fruit give bonus points, but if you take too long, the relentless Baron Von Blubba appears to hunt you down.