Some blocks are indestructible, some blow up at the slightest touch, and so on. Some are invisible and will only appear once the ball collides with them once. In the meantime, you have to use the ball to destroy an array of blocks above you. Failure to do so results in you losing a life.
You control a paddle with your mouse and use it to keep a little white ball aloft in the air.
Like all the various clones of Breakout that came before and after it, DX-Ball plays like a combination of pinball and Pong.