Areas exclusive to Cave Story 3D

There are some locations exclusive to Cave Story 3D, some of them change already existing rooms or add entire different follow-ups for the maps on the vanilla game.
== Egg Corridor Detour ==
The Egg Corridor Detour is a location used in place of the bridge leading up to the Side Room and Egg No. 00 in Egg Corridor?, due to the bridge collapsing. This area is accessed by a ventilation shaft that consists of Critters, Beetles, Basu, and the Time Bomb in small increments. It seems to have a focus on hardly-used features in the original Cave Story and also adding features that would only be possible for a 3DS version of Cave Story, with the transporter tubes being an example.
		
== Inner Wall ==
The Inner Wall is an area in Cave Story 3D. It is accessed through a passage submerged in water at the Rest Area in Plantation. It is similar to the Outer Wall, and uses the same background. 
The only enemies present are Orangebells, ghostly Sandcrocs, bats and Hoppys. If Quote reaches the end, he can access the Small Grave and obtain the Prinny Cap.
The inner wall official end got a door leading to the Small Grave, although, the Inner Wall location is also used in the fanmade challenge Nemesis Challenge, for Cave Story+, it was named the Leeward Side and the end passage of it was also changed.
		
		
== Small Grave ==
See Small Grave (sublocation)
== Falling Tower ==
The Falling Tower is an area in Cave Story 3D. It is accessed by defeating Misery and The Doctor. The area is quite large, with sand hills, red flowers, a broken bridge with the enemies that reside here are Ravils and Heavy Press.