how to play?

Initially, 5 randomly lit bars, at least one lit, are given to you. Your job is to press to a green bar where the arrow is currently pointing. The arrow goes up-to-down at a regular rate, going back up each time it reaches the bottom. For each successful press, you are given a point. After 10 points, one bar is added, and the speed of the arrow becomes faster. The bar and speed of the arrow finished once there are a total of 10 bars. The game ends once you mess up.