To light a light bulb in the Battery Color Sort, you need to put four batteries together, and they must be the same color - this is a prerequisite. The light will glow the same color as the color of the batteries. Place them in special transparent flasks, but you will have to sort out the different colored batteries as they are mixed up. Move them around the flasks until all the colorful lights light up and you can move to the next level of the Battery Color Sort game.