Dream World

The Dream World is a world of the dreams of people of the Real World.

List of Dream Worlds

 * Subcon, Super Mario Bros. 2 takes place.
 * Dream Depot, Mario Party 5
 * Slumberland, ruled by King Morpheus and his daughter Princess Camille.
 * Nightmare Land, a dark world which represents all the fear and darkness of the world's nightmares, ruled by the Nightmare King.

Mario & Luigi: Dream Team
The Dream World is a major location that appears in Mario & Luigi: Dream Team. It is where Mario meets Dreamy Luigi for the first time. In order to enter the Dream World, Luigi must sleep on a special type of pillow which then can open the portal to the Dream World. Mario (or any other character) can then jump through the portal to enter the 2-D version of that level. Also, Dreamy Luigi also appears whenever Mario enters the Dream World to aid him in his quest.

Layout
Much like Bowser's Body from Mario & Luigi: Bowser's Inside Story, gameplay in Luigi's Dream World is played in 2-D.

Dreamy Pi'illo Castle
The dreamy version of Pi'illo Castle. This area can be accessed by the pillow located in the large room of Pi'illo Castle. The boss that is fought here is Dreamy Mario.