Secret lots are featured in The Sims, several expansions for The Sims 2, and The Sims 4 as lots that are hidden from the neighbourhood view, and generally only accessible to Sims upon meeting specific requirements or carrying out a specific action. The Sims 3 features the Hidden tomb lot assignment which hides the lot from Town View and prevents Sims from autonomously routing to the lot, but these lots are otherwise accessible at any time by player-controlled Sims.
The Sims contains two unused lots that cannot be accessed without modifying the game files, House00 and House11. Both lots are large and completely empty, missing even the invisible objects and portals required for the lots to function correctly. House11 can be seen in pre-release screenshots of the game, containing a large and complexly designed house.
The Sims: Makin' MagicEdit
Sims can climb a beanstalk that has grown to full height. They will be transported to a cloud with a giant Will Wright sleeping next to a spilled can of Magic Beans, which can be stolen. The sleeping Will Wright cannot be woken or interacted with in any way, but Sims can view him which will display a thank you message for playing The Sims.
Sims can return home from the clouds by interacting with the beanstalk.
The Sims 2 Edit
The Sims 2: University Edit
Sims at college gain access to the Secret Society Club House when they befriend three or more members of the Secret Society. This lot contains a variety of career rewards and aspiration rewards. Each campus has a different Club House. After gaining membership, the Sim can go to the Club House anytime they want by using the phone.
The Sims 2: Bon Voyage Edit
Maps can be found by digging or taking tours on vacation in The Sims 2: Bon Voyage, and they can lead to a secret lot in each of the three exotic locations. Each lot is home to a unique NPC character. The hidden lots are not editable in any manner without modifying the game files.
The Sims 2: FreeTime Edit
Each of the 10 Hobbies in The Sims 2: Freetime has an associated secret lot, containing objects that relate to the hobby and allow Sims to increase their skills (unlike regular community lots). Sims can gain membership to a Hobby Lot by passing Level 5 in Enthusiasm to the associated hobby. There, Sims can interact with other Sims who share their hobbies, perform hobby-related activities, and can raise their skills. The hobby lots are not editable in any manner without modifying the game files.
The Sims 2: Apartment Life Edit
In The Sims 2: Apartment Life, a secret neighborhood called "Magic" is added. It is only accessible by witches. There are two lots, where you can meet the head witches, buy reagents from them, and use their thrones, cauldrons and spell books. Although each lot is themed to a specific alignment, there are no restrictions as to which lot witches can visit. Additionally, although not a secret lot, Belladonna Cove contains an intentionally hard to find residential lot called Watervista Palace, modelled on Baba Yaga's hut.
The Sims 4Edit
The Sims 4 features secret lots which can be accessed through specific interactions with certain objects. Once visited, the secret lots can be travelled to directly from their portal. Sims with Level 7 Wellness skill can teleport to the secret lots while meditating if they have previously visited the lot.
Willow Creek's secret lot is Sylvan Glade, and it can be travelled to through interactions with the Sylvan Tree located in Foundry Cove, adjacent to the Crick Cabana lot. In order for the portal appear, a Sim must first "Water" the tree, then "Compliment Leaves" and then "Talk". Entering the portal triggers a text adventure, which must be completed in a specific manner in order to travel to the lot. Sylvan Glade is a unique world that contains numerous plants, logs to search for Frogs, and a pond containing the rare Treefish, which can only be caught in Sylvan Glade. It's required to complete the Fish collection.
Due to being kept in perpetual twilight, Vampires are immune to sunlight in Sylvan Glade.
Oasis Springs' secret lot, called Forgotten Grotto, can accessed through an abandoned mine entrance found behind Desert Bloom Park, and Affluista Mansion. Each of the entrances requires Handiness of level 10 to be pried open, and become accessible. Similar to its Willow Creek counterpart, Forgotten Grotto has a text adventure that has to be completed before you can proceed, and the place contains a lot of Rocks to complete your Fossils, Metals, Crystals and Elements collection. It also has a unique fish, the Batfish, which can only be caught there and is required to complete the collection.
As the grotto is an interior cave, Vampires are immune to sunlight in the Forgotten Grotto.
The Sims 4: Outdoor Retreat Edit
Granite Falls' secret lot is called "Deep Woods" and can be accessed via the Bramble Patch in The Forest. The Hermit's house is located here, as well as many plants, rare insects and the Mountain Lionfish, which can only be found here.
The Sims 4: Get to Work Edit
Sixam is a secret lot included in The Sims 4: Get to Work. Sims can travel to the planet by constructing and upgrading a Wormhole Generator whilst in the Scientist career, or by upgrading a Rocket Ship with a Wormhole Generator. Scientists may receive an assignment to travel to the planet, where an alien party will be held in their honour.
Aliens can be found inhabiting Sixam, and three unique kinds of otherworldly flora can be found and harvested. Two new crystals and metals can only be found on Sixam, the former of which can derive a new Element. There is also a six-piece collection of Geodes which can exclusively be found on the planet, which give Environment boosts when placed in a house.
As Sixam is distant from the sun, Vampires are totally immune to the effects of sunlight here.