You can hear a symphony consists of sounds that bullets & missiles are fired.
A narrow way seems just like a nest of ants.
There are tons of turrets, Missile Launchers, Attractor Bases and Repeller Bases on the wall.
It becomes harder to hit them because they are placed behind complex landforms.
After you despair of destroying them, you will be forced to avoid their bullets or missiles.
Found C-3PO !!
C-3PO "Hi, Master Luke! Here is the midpoint of this level. Good luck!! "