This game is all about timing. It is also about lasers. You have a disk that is at the bottom of the screen. You can use your arrow keys to move it around. In order to fire off your laser, you will push the left mouse button. You have to fire your laser at various notes that are moving towards the bottom of the screen. When the notes are in the middle of the screen, they will light up and give you more points. This game is fun, addictive, and challenging. Be warned though, it might consume hours of your day.