Go to the Options menu and set up the options as follows:
Difficulty - Hard
Ships - 2
Continues - 1
Then select Sound 65 in Sound Test and press A. There won't be a sound, but when you start playing, you'll start with 99 ships.
Hold down B and press the Start button on the title screen.
You should start on the second level now.
Highlight ''Sound Test'' in the Options menu. Then press A to listen to the sounds in this order: Sound 1, Sound 1, Sound 9, Sound 2. A stage select option should appear at the bottom of the screen.
Press C, A, C, A, Start, B on controller two at the ship select screen.
Go to the Options menu and set up the options as follows:
Difficulty - Hard
Ships - 3
Continues - 2
Then select Sound 77 from Sound Test and press A. No sound will be heard, but when you start playing you can gain Level 20 firepower by pressing B on controller two.