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Andrews Dungeon of Doom was an unreleased room that tested and developed upcoming dens, but it has been deleted. It was never legitimately accessible, but it could be entered by following someone who was already in the room. The most recent den contained in this room, in November 2017, was Cosmo's Tree House.
- It was changed occasionally. In January 2017, it contained Sir Gilbert's Palace.
- In Andrews Room of Doom, there was a portal that led to this room. Next to the portal, there was a sign that labeled this room "Cosmo's Den 2.0".