Beta Dimension

The beta Dimension is a place where Notch tests out his updates and creations, almost all of the mobs and npcs besides those loyal to the Rainbow Creeper are just lines of code and aren't actually alive. Jimmy Slade and his friends first visit this world to find Notch, and later to defeat Entity 303. In order to enter the Beta Dimension, you have to die while going through a secret underground river hidden somewhere in the overworld. Only Herobrine, Notch, Entity 303, The Rainbow Creeper, and few others know of its location. This world has many different elements of Minecraft that have been removed and have not been added, as well as will be added. Here, The Rainbow Creeper dwells.

See also, dimensions.