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One of the two Party Worlds is called Walnut World.
The image is called "Epic."
The developer of the game has announced that there will be new spaces in the game called "Party Worlds" which are designed to focus on socializing over combat. The developer says that Party Worlds can be used to hang out, play fun mini- games, and make new friends.
To kick off the initiative, the company collaborated with community members fivewalnut and TreyJTH on a pair of examples. There are two amusement parks, one of which is called Late Night Lounge and the other is called Walnut World. The developer is taking submissions for more community-made spaces. Use the tag "Party World" for an island and submit it through this submission form.
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There is a second Party World called the Late Night Lounge.
The image is from Epic Games.
Party Worlds are an attempt to transform the game from a competitive online game to a broader online social space. This has resulted in a number of features, including an in-game concert from Scott, a combat-free Party Royale mode, and more. Users can create islands to serve as social spaces instead of arenas in the game. With its latest initiative, the company appears to be promoting and encouraging users to make these social-first spaces.
Party Worlds are meant to be a destination rather than a discovery tool.
This all ties in to the plans of the company to create a 3D online space for people to exist in. The maturity of the technology of the game, not to mention the game's enduring popularity, mean that the ambitions of the company should be taken seriously.