The goal of this game is to reach the end of the cave with the yellow submarine. The cave is formed using the amplitude of the song. Try to catch as many sea shells as you can on your way to the finish. But be careful! When you hit the floor or ceiling of the cave, the cutoff frequency of the filter will get lower and the passband will get smaller. Try to reach the end of the cave before the cutoff frequency reaches below 10 Hz.
Type 'h' to make the submarine go up.
The song used in the game is "Yellow Submarine" by The Beatles.