Crossposted to http://www.minecraftwiki.net/wiki/The_Metaworld
Reaching The Metaworld
From any of the other dimensions, press "Escape", then "Save and Quit", and then "Exit Game". The current dimension will be replaced by another visual display, usually a "desktop" of some kind. If you examine the edges of this "desktop", you will notice that it is embedded in a Metaworld Portal Frame. The Metaworld is visible beyond the borders of this frame.
The Metaworld is superficially similar to the Overworld in many respects, but there are important differences. A different set of controls is used for navigation, and many activities, such as removing and placing blocks, crafting, and combat, are more difficult. Time moves slower in the Metaworld, with a tick rate of one tick per second.
Items gained in the Metaworld cannot be brought back to the other dimensions; instead, the Metaworld has its own "meta" resource game. The player must continually ensure a separate Metaworld supply of food, protection from hostile mobs and griefers, and electricity for the Metaworld Portal Frame. If a player neglects this aspect of play, they may find themselves involuntarily transported from the other dimensions into the Metaworld.
Because of its high difficulty level and the fact that items and experience do not transfer, many players prefer to minimize time spent in the Metaworld.Posted by benrosen at May 7, 2013 11:42 AM | Up to blog