Big Boo's Basement

Big Boo's Basement is meant to be an intermediary level, leading from Big Boo's Haunt to Big Boo's Forest. The level itself isn't particularly noteworthy, as it consists of a few rooms and serves as more of a connection to the two levels, instead of being it's own level. This level doesn't have any stars.

The level is entered via a cellar door somewhere in the outside of Big Boo's Haunt.

Basic Layout
Big Boo's Basement starts on a wooden set of stairs, leading into a tunnel reusing the textures of Hazy Maze Cave. Inside the tunnel is thick, dark fog, obscuring most of the level. The level isn't really a basement, but is actually a tunnel. Inside the tunnel, there's a wooden path, leading to the exit. Sometimes, you'll enter a fork on the road, with one split tunnel leading to elsewhere but without a wooden path. This is a dead end. The entire level is meant to be mazelike. When you reach the end, you'll climb up a ladder, into a shed in Big Boo's Forest. The next time you enter Big Boo's Basement, the level will be skipped and you will immediately go from the two levels instantly.

Phenomena
Big Boo's Basement, unlike the other two levels, doesn't have much documented phenomena.

Eyes in the darkness
Some players have reported strange white eyes illuminating the dead ends of the tunnels. There's been a lot of inconsistency with these reports.

Most people ignored the eyes, and went through the level normally.

Some people went towards the eyes, and reported that Mario got a normal game over.

A small percentage of people said that some kind of tentacle dragged them into the darkness, giving them a game over.

Big Boo's Chase
Players have also documented that they were being chased by Big Boo throughout the level. They could hear Big Boo laughing, becoming louder and louder the more they stalled. None have stated that they actually saw Big Boo because of how dark it was, but only heard the laugh getting louder and louder.