Cave Story/Outer Wall

The outer wall is the means of access to the Plantation, the step before the doctor. Unlike other maps, gravity pushes items to the left rather than downward.

The booster V2.0 allows you to speed through the map without too much difficulty, otherwise, you will have to climb the wall slowly.

Nikumaru counter
If you have Booster V2.0, you can collect the counter. It is available in an alcove located in the wall, recognizable by a few turning rails.

Nemesis
Below the exit from the Egg Corridor, you can find a small dwelling. You need Booster V2.0 to safely enter, as V0.8 doesn't have sufficient control to enter or leave consistantly.

This dwelling contains a few tiny people. The wife is looking for her husband who can be found in the graveyard. When you retrieve the tiny person and bring him home, you can optionally trade the sword for the Nemesis.