Experimental Habbo Hotel
From Pool's Closed Wiki
In early 2007 nigras discovered a special habbo server used for testing. Everything familiar was present, and then some, except the hotel was virtually deserted. User count averaged 14-18 most of the time. There were no restrictions on names whatsoever. You could even give yourself an NPC name and they would vanish while you were logged in. A few MODs or other Sulake personnel were assumed to be present but encounters were rare. Usually it was another nigra or random habbofag who somehow discovered it.
The hotel is long since removed or access disabled.