Secret sub-neighborhood

A Secret sub-neighborhood is a special type of sub-neighborhood in The Sims 2. First appearing in The Sims 2: Pets, this type of sub-neighborhood adds many new things to an already existing neighborhood, such as new families in the family bin, new townies, and secret lots. Secret sub-neighborhoods can only be visited, not lived in, and its lots can not be edited.

Pets
In The Sims 2: Pets, the secret sub-neighborhood is called Pets. It adds new Pet townies that are able to go into the main neighborhood and any other sub-neighborhoods. It also adds the Roseland family and the Crittur family, both of which can be placed in the main neighborhood or any sub-neighborhoods. Unlike most of the other secret sub-neighborhoods, Pets can not be visited.

Weather
In The Sims 2: Seasons, the secret sub-neighborhood is called Weather. It adds the Garden Club Sims that are able to visit any lot in the main neighborhood and any other sub-neighborhoods. The families it adds are the Ottomas family and the Ramaswami family, which can be placed into the base neighborhood.

Exotic Destinations
In The Sims 2: Bon Voyage, the secret sub-neighborhood is called Exotic Destinations. It adds the "tourist" townies that appear at the vacation destinations. The family it includes is the Traveller family.

Hobbies
In The Sims 2: Freetime, the secret sub-neighborhood is called Hobbies. It includes many new secret lots, called Hobby lots, the Hobby instructors, and two new families, the Picaso family and the Cooke family.

Magic
In The Sims 2: Apartment Life, the secret sub-neighborhood is called Magic. It adds two new lots, the Palace of Neverending Light and the Fortress of Eternal Darkness, new Witch Sims, many new townies, and three new families, the Gavigan family, the Goodie family, and the Newson family, who are featured in every game's neighborhoods.