This category has to do with immersive, graphical, persistent state environment, virtual worlds -- like a WideOpenSandbox {{MMORPG}} that is ''all'' sandbox. These worlds could someday become TheMetaverse, while some argue that they already are. Their counterpart, OnlineGames, may use the same PhysicsEngine and physical hardware, but are centered on a particular game title, and unlike the often long-lived Virtual Worlds, are likely to become an OrphanedSeries. The line between Online Games and Virtual Worlds is blurry, as extensive [[GameMod modification]] can turn one into the other; such as a private server running ''VideoGame/WorldOfWarcraft'' without mobs of monsters, or a ''VideoGame/SecondLife'' island that features a user-scripted paintball game that is only playable in a limited area.

For in-universe virtual worlds, see LotusEaterMachine, {{Cyberspace}} and InsideAComputerSystem.

* ''Active Worlds''
* ''Croquet''
* ''VideoGame/{{Furcadia}}''
* ''Open Simulator''
* ''VideoGame/SecondLife''
* ''Franchise/TheSims''