In the last few days, SBDWolf broke its own WR. The biggest breakthrough is the disorderly terrain in Stage 13 and Stage 14. Could you teach me how to achieve this? What is the principle of this disorder?

https://gamefaqs.gamespot.com/snes/588362-gradius-iii/cheats

the relevant portion: 

<B>Stage 3</B> - When you reach the lower level of the stage, there is a platform in the ceiling that drops down. When it drops down, fly just below the part where the platform was.
Prerequisite: Destroy all of the ground targets in the stage up to that point.

<B>Stage 4</B> - In the last set of Moai heads (they look like Easter Island heads), there is one laying down which will lift itself up. Fly behind it.
Prerequisite: Nothing must be highlighted on your powerup bar.

For the "destroy all ground targets," you need to kill all the dispenser enemies.

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