If you continuously die, Band-Aid Girl should eventually become glitched. While she is glitched, standing next to her should teleport you to the negative level. And you are correct, there are negative levels for Worlds 1 - 6.

If you continuously die, Band-Aid Girl should eventually become glitched. While she is glitched, standing next to her should teleport you to the negative level. And you are correct, there are negative levels for Worlds 1 - 6.

Here is a video of somebody unlocking the first negative level.

If you continuously die, Band-Aid Girl should eventually become glitched. After completing the stage while Band-Aid Girl is glitched, you should be able to access the negative levels. And you are correct, there are negative levels for Worlds 1 - 6.

If you continuously die, Band-Aid Girl should eventually become glitched. While she is glitched, standing next to her should teleport you to the negative level. And you are correct, there are negative levels for Worlds 1 - 6.