On the ruler at the bottom of the screen running "notes"-sparks. When such a "touch"-the spark reaches the tri-color area before the bomb, you have to press the space button. 4 unsuccessful attempts - you lost. And if you will be able to click a space in time, in the Overture will sound the drum sound exactly in time with the music. Don't let me down, and without your help the band will not be able to play the Overture!