4th Floor

4th Floor is an area in B3313.

Description
A hub resembling the beta lobbies with a tan hue.

The main section has a checkerboard and red carpet floor. There are five doorways, two pipes and one foggy entryway. Entering the foggy entryway cuts out the music and reveals a small courtyard with a gold Toad statue and a balcony.

The two doors to the left of the double door lead to a shared hallway with Toad's Lobby on the right and Polygonal Chaos on the left.

Origins
The area's layout mainly originates from Greenio's TAPE TWELVE, and the pipe model taken from the game's source code.

The music playing is the "Inside Castle" track from the Super Mario 64 OST.

Two-way

 * Beta Lobby D: Enter the double door in the main room.
 * Toad's Lobby: Enter the door that is close and to the left of the double doors, then keep right.
 * Silent Sewers: Enter the door that is close and to the right of the double doors.
 * Bowser's Domain: Enter the pipe to the left of the double doors.
 * Nebula Lobby: Enter the pipe to the right of the double doors.
 * Polygonal Chaos: Enter the door far from and to the left of the double doors then keep left.

Painting

 * Ultramarine Stronghold: Enter the door far from and to the right of the double doors.