Sorting Balls - Sort the Bubbles Style Puzzle Game

Sort the bubbles into one tube. In other words, you'll need to place the bubbles on top of other bubbles that match the same color. The rules are that you must only place a ball on top of another ball that matches the same color. You cannot put red on top of orange, or blue on top of green. You must place the blue ball on top of the blue ball. Once you have placed all balls matching a certain color into every tube, you win and get to move on to the next level.