4th Floor (beta)

4th Floor (beta) is an area in B3313.

Description
A hub with several colorful hallways and pathways leading to various different levels.

Most interestingly, the levels in this hub seem to share a theme with either being or relating to some sort of alpha version of the game, with many of the courses being labeled as "tests".

Origins
TBA

Two-Way

 * 3rd Floor (beta): Enter the southmost pipe in the tunnel hallway.

Leading Away

 * Surface Test: In the tunnel hallway, enter the first tunnel on the left and enter the pipe.
 * Snow Tunnels: In the tunnel hallway, enter the second tunnel on the right and enter the pipe.
 * Athletic Fortress: Either enter the pipe from the second tunnel on the left, or enter the pipe all the way in the back of the checkerboard floor area.
 * Collision Test: In the tunnel hallway, enter the first tunnel on the left, skip the first pipe, and enter the pipe after it.
 * Test Course: In the tunnel hallway, enter the third tunnel on the right and enter the pipe.
 * Dreamy Heights: From the center room, enter the west door, go forward, and enter the pipe.
 * Bob-omb Test Field: From the center room, enter the east door, go through the double doors, and enter the painting.
 * Stone Island Pathway: From the center room, enter the north door, and enter the pipe in the stone hole.
 * Sombrero Land: Enter the pipe on the left side of the checkerboard floor area.
 * Brown Stony Steps: From the center room, enter the east door, make a right turn, and go straight before reaching the pipe.