The object of the game is to flood the whole board with one color. You start with the top left corner and progress by selecting one of the colored buttons, once you change area color the adjacent square with the same color also changes.

The idea of this game is to push the red ball into the yellow ball, by dropping some objects on it, the game shall recognize circles and rectangles and smooth them. You may also draw a small circle that will change into green joint on which you can hang (and rotate) one shape.