Color box

The box can move on the platform corresponding to the background color. If the background is blue, you need to move on the blue platform. If the background is red, then you need to jump on the red platform, etc. If you pick up the blue ball, box increases and thus becomes heavier and starts to jump hard. If you raise the white ball, the box decreases, thus it becomes easier and begins to jump higher. The fewer attempts to pass a level, the more stars you get.