Foggy Swamp

The  is a limited-time premium decoration released on October 4, 2016, as part of the Treehouse of Horror XXVII Event. It included in one of the 2 Crazy Iguana Lady Bundle offered and  only be obtained through that bundle offer.

It returned on January 23, 2018 during the Bart Royale 2018 Event in the Doomsday Mystery Box

Trivia

 * While it's not unique, only one obtained in the event.
 * It can be placed on grass, pavement or dirt.
 * The  offered exclusively through the Alternative bundle version. Should a player who  offered the regular version  to obtain it, they  to "reject" the deal by purchasing the Crazy Cat House for its full price from either the characters or the premium section of The Store. This  the bundle offered for them  now the Alternative one.