The universe of the OASIS is split into 27 sectors each 10 light hours across, arranged like a Rubik's cube. The sectors have zones/worlds that can be any shape and size, and each has different rules/flags. Zones could allow or prevent magic, technology, PvP (Player vs. Player), teleporting, communications, and more. For instance, Ludus, the schooling planet, is a no-PvP zone. The worlds within OASIS can also have different settings. It is described that Ludus is always day, Neonoir is always night, and Archaide's sky never changes with a volcano always on the horizon. Planets can be player built, owned, and colonized, or created by the developers.
Worlds and Zones
Zones, Landmarks and Locations