Inside the Walls

Inside the Walls is an area in B3313.

Description
An endless black void...with someone familiar but hostile approaching you at this very second. When he touches you, the game will crash. The words "GET ME OUT" are flashing on the screen until that happens.

Origins
The area's "layout" appears to be an original creation.

The music playing is the "Merry-Go-Round" theme from the Super Mario 64 OST.

Plot significance
This bad ending of the game could mean that Luigi is still trapped somewhere within the castle walls, doubly so if the player is controlling Luigi as well.

Leading here

 * Castle Grounds (Ending): Jump into the hole in the east wall of the castle.

Trivia

 * The chasing Luigi is a retextured 1-Up Mushroom, although with game-crashing properties.