You get 1 point for each hit. And hurry! They come and go really fast, so don't hold back and rush that finger to the screen. But wait, maybe it's not a good idea, because the right color have just changed! Don't hit that, or you'll lose one of your precious points.
So, after the 30 seconds, what score did you get? Did you make it to the highscore? Did you beat that annoying friend or yours?