Clu Clu Land

Clu Clu Land's story starts with a type of Sea Urchin, the Unira, stealing all of the treasures in the underwater kingdom of Clu Clu Land. Bubbles, the hero, sets out to retrieve the treasure. The object of the game is to uncover all the gold bars in each stage while avoiding the Unira and Black Holes. The gold bars usually form an outline of something, such as a heart or a mushroom. There are Turning Posts throughout the stage, and that's the only way Bubbles can turn around to go to another side. Bubbles can stun the Unira by using a Sound Wave. When they're stunned, Bubbles can push them into the wall to get rid of them and receive points. If Bubbles is hurt by the Unira, she will lose a life. A life is also lost when Bubbles falls into a Black Hole, or when time runs out. This only happens if Bubbles hasn't moved. If Bubbles moves and time runs out, the game is over. The game also ends if Bubbles has lost all her lives.
In later levels, the player has to pass over the gold bars twice to uncover them, and passing over them in later levels will re-bury them.

Source: Wikipedia, Clu Clu Land , available under the CC-BY-SA License.