Java Edition:B Creative Mode
In version 1.0.0 RC1 and 11w49a (a 1.1 snapshot), pressing B would toggle the player between Survival and Creative mode. This occurs even if cheats are disabled. This allows the player to fly, be invincible, break unbreakable blocks, and access the Creative inventory for several unobtainable items and unlimited resources. The Creative mode properties do not save when updating or reloading the world, but any blocks broken or items spawned in from the Creative inventory remain. This does not work on servers, as it only changes the client's gamemode. At most, the player can fly for a few seconds before being kicked for flying (unless allow-flight is set to true in the server.properties).
Uses
Temporary Creative mode has a wide variety of uses. The player is able to use flight to travel long distances quickly, spawn an infinite amount of resources from the Creative inventory, instantly break any block in the game, including unbreakable blocks, and the player could obtain many items which were or are unable to be gathered in Survival mode. These items are:
Gallery
Spawn eggs in the B Creative Mode inventory.
Using B Creative Mode to fly.
See Also
References