The brown ball is actually the muzzle of a cannon in Destroy Figures, from which an infinite number of balls of the same brown will fly out. This is necessary to destroy the white shapes flying from above: squares, triangles, rectangles and polygons. They need to be shot. So that no figures cross the dotted line at the bottom of the screen. In the circle you will see the number ten. It means how many pieces you can pass through the border, but if there are more than ten of them, the game will end. If you look closely, on the field, in large, pale numbers, your earned points in the game Destroy Figures are counted.