As the song plays, key commands ('A', 'S' keys and arrow keys) will come down the timeline, press the in-time to score points. They must be in the red area to be correctly counted. For every command you perform in-time, your score will increase. The more you get in a row, the higher your rating will get. A higher rating means you score more points for each command, but your time box will get smaller. Miss one, and your rating will drop. Try to score as many points as you can.