Kaboom!

The game is similar to Avalanche in concept, but instead of there being a pre-existing set of rocks across the top of the screen that randomly fall, a character known as the "Mad Bomber" moves back and forth randomly dropping bombs. As the game progresses, the Mad Bomber traverses the top of the screen more erratically, dropping bombs at increasingly higher speeds, making each of the seven higher levels more difficult. (wikipedia.org)