Sorting games with the element of a puzzle are perfect for training your brains. In Pile It 3D, you have to sort colorful bubbles in different tubes. The first levels seem very easy and not challenging at all. But once you progress, the tasks become more difficult and interesting. For instance, you have to divide the balls in a certain order and make them go through twisted and even knotted tubes and you don’t know which way is the correct one so you will have to restart the level several times to get it right.