Overworlds are the core of Cubic Castles. This is where all the Mines, Launchpads, Cubic Realms, and player-created Realms are located at. If you're a newbie and just started the game, you will need to complete the Tutorial before being able to access them. If you're an advanced player, they can be accessed through Lobbies and leaving the main realm doors. Whilst Lobbies provide the ability to travel in between all the Overworlds, Launchpads also provide an alternate option of doing so.
As of now, there are five Overworlds: