Brown cavern

The brown dungeon is a secret dungeon dungeon found in the secret lobby above the tutorial that contains reskinned enemies from each of the dungeons. Its boss is identical to the yellow boss and has the same drops as it.

To enter the brown dungeon you first need to enter the tutorial and scale the large hole in the roof using the whip or charged whip, or the currently unobtainable gravity gum and gravity boots as no combination of jetpacks and boots will have enough fuel to make it to the top.

In the broken down alternate lobby go to the first room on the right where you create lobbies, crawl into a hole into the last room on the right, and press the green button like you normally would when creating a lobby.