The Enigmansion is World 4-3 in Paper Mario: Sticker Star. Here, Mario helps the steward of the mansion who is outside in a snowstorm. The steward tells Mario about something haunting the mansion and gives Mario the Book of Sealing to capture the ghosts with. The mansion's name is a portmanteau of "enigma" and "mansion".
In this area, the mansion steward asks Mario to capture a group of Boos by returning them to the Book of Sealing. When he enters the mansion, the Boos scatter around the mansion. Mario explores the mansion and captures all the Boos. After he finishes, he returns the Book of Sealing to the basement, but Kamek, who reveals to have released the Boos from the Book of Sealing to begin with, releases the Boos again. The Boos form a Big Boo and Mario is forced to do battle with it to return the Boos to the Book of Sealing.
Afterwards, the Enigmansion steward asks Mario to come to the left room of the mansion. Once Mario arrives, the steward gives Mario a portrait of the Forebear that the steward inherited the mansion from. Mario then has to paperize to get the portrait scrap to progress to Whiteout Valley. The Comet Piece is outside once the Big Boo is defeated. The Things found in this level are an oven, a refrigerator, a stapler, a watering can, and a cake. There is a secret door that leads to the left side of Decalburg, near the shop where the Toad sells things. Once the portrait is taken to Whiteout Valley, the forebear in the portrait comes alive and lets Mario go up a ski-lift.
If Mario decides to revisit the Enigmansion after releasing the forebear from the portrait, the forebear is shown to have regained ownership of the mansion and has made the previous steward his servant. The forebear asks Mario to lounge with him while he drinks tea and remarks on how he rarely receives any visitors anymore. Afterwards, the steward comes in with a tray of tea and gives Mario a HP-Up Heart.
There are 100 Boos to be found in the mansion:
The Secret Door is at the top of the rear staircase. It provides a shortcut back to Decalburg, at the Sling-a-Thing location and the Things seller.
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