Hypixel has done that to an extent. The way most servers do it nowadays with with a server proxy that shunts client requests to a specified server transparently

Hypixel has done that to an extent. The way most servers do it nowadays with with a server proxy that shunts client requests to a specified server transparently -- you "world hop" using in-game mechanics (i.e. walking through a portal, clicking on a sign) https://www.spigotmc.org/wiki/about-bungeecord/ https://www.spigotmc.org/wiki/about-bungeecord/ And as others have already mentioned, WorldQL is an effort to transparently replicate and shard the world without even requiring "world hopping"