Neptune Screens 7, 8, and 9 - First Sub Damage Boost

Screen 7

This is a short screen with a single met, and a cracked pipe. This screen's presumed intent is to teach the player a charge shots or extra lemons will go through enemies and damage cracked pipes releasing potentially bad effects like the damaging steam jets.

Use specifically a single lemon to destroy the Met. Once you are near the ledge fire a lemon at the crack and jump over the passage down. You should release the steam jet and take 4 HP damage from it and fall through the screen transition in iframes. This lets you go through the first steam jet on screen 8 without being stopped by the flinching animation.

Screen 8

Screen 9

Use the damage boost from the end of screen 8 to slide past the steam jets while still in iframes. fall on the right side of the screen transition, and then start holding B to charge the buster for the next enemy (you will not charge until after the screen transition.