It's a physics-based puzzle game. Control is with the keyboard. Press the [left] and [right] arrow keys to move the wheels in either direction. Press the [R] key to reset a level if you fail, or if you fall off the screen. Press the (II) button on-screen (using the mouse) to pause. You have a limited time within which to complete each level. If you fail, within the time allotted, you lose one life. Lose all 5 lives and it's game over.