Tap on the screen so that the ball goes through the color that it turns - and watch it on the way down as well! See how far you can get before you mess up.
The game is super simple and lightweight, which means that it won't eat away at your battery and take up too much space on your phone. The colors are great, and the black background prevents it from hurting your eyes too much. The controls also keep up with you, which is something that you don't see often in this type of game.
This does get a little repetitive after a while, and the game doesn't last all that long either, so you won't get hours and hours of entertainment out of it.