The Enigmansion

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".

History
In this area, Mario tries 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 releases the Boos. 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 Pink Toad asks Mario to come to the left room of the mansion. Once Mario arrives, the Toad gives Mario a portrait of the Forebearer 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 Toad in the portrait comes alive and lets Mario go up a skilift.

Boo Locations
There are 100 Boos to be found in the mansion:

Area Tattles

 * Outside: "What a fantastic mansion! And in such a remote spot in the mountains!"
 * Lobby: "What a huge lobby. Maybe this is some celebrity's house."
 * "Mario, you aren't just a little afraid, are you?"

Secret Door
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.

Enemies

 * Scaredy Rats
 * Boos
 * Boo Stack
 * Big Boo (Boss)

Things

 * Oven
 * Refrigerator
 * Stapler
 * Watering Can
 * Cake

Trivia

 * In the Prima Games Guide, it claims exiting the mansion via the Secret Door shortcut will cause stickers collected in the mansion to change into others. However, this is untrue. It simply makes them reappear.
 * After clearing the mansion of Boos, all stickers found in the Mansion disappear, along with most enemies. In addition, the music changes. There are still one or two Scaredy Rats, however.
 * When talking to the Steward while he camps out, an eerie remix of the Ghost House theme from Super Mario World starts to play and abruptly ends when the dialogue is finished.
 * Even when the player travels with the boat to the ice level and use the secret shortcut to Decalburg the boat will be back at the harbor, even though no-one could've piloted it.