In the game Sand Balls, you will go to a location where you will need to get balls of various colors. Before you on the screen you will see a truck that stands on a specific platform. Above it at a certain height will be a rock within which there will be balls of various colors. You will need to use the mouse to dig a tunnel, which will have to end above the truck. Then the balls roll down it and fall into the car body. These actions will bring you a certain amount of points, and you will go to another level.