Java Edition Classic 0.0.12a

0.0.12a"0.0.12a is up" – The Word of Notch, May 20, 2009 was a version of Classic released on May 19, 2009, at 22:36 UTC.While some sources imply that this version was released on May 20, due to timezones differences it was actually released at 22:36 UTC on May 19 (which is 00:36 on May 20, Sweden time). It added bedrock, water and lava, along with a world boundary and a new world generator.
== Additions ==
=== Blocks ===
; Bedrock
* Unobtainable to the player.
* Initially referred to as "unbreakable stone".
* Bedrock and the layer above (if at the bottom of the world) is always dark even if exposed to the sky.
* Cannot be broken, placed against, or otherwise selected.
; Water
* A type of liquid.
* Does not drown the player.
* Is transparent.
* Spreads infinitely.
* Water does not work outside the map (it won't spread from world border after terrain generation).
; Lava
* A type of liquid.
* Originally was transparent, just like water. 
* Underneath lava, the mist is thin and orange in color. 
* Does not deal damage to the player.
* Spreads infinitely.
=== World generation ===
; World boundary
* An infinite ocean now surrounds the map.
* The player can no longer pass the edge of the map.
* Water next to lava will not produce stone upon world generation.
=== Gameplay ===
; Controls
* Pressing cycles between four levels of render distance.
* Pressing generates a new level, with a new level generation screen.
; Swimming
* Only applies to players. Humans move at full speed in the water. Was originally much slower than in later Classic versions.
== Changes ==
=== Mobs ===
; Humans
* No longer get reset on level reset, meaning there is no way to get rid of mobs now.
; Physics
* Water and lava now flow to fill any available space below or next to it.
** With just one water source the entire world will be flooded.
* Water next to lava produces stone.
* Player jump height increased by about 0.5 blocks.
=== World generation ===
; New level generator
* Terrain is messier with more bumps visible on the surface. It also now generates in islands.
* The terrain always generates one block above ocean level.
* Lakes occur when the surrounding water is at a higher level than the terrain.
* All dirt with access to sunlight will not become grass block upon world generation if below water level.
* Lava lakes also spawn occasionally.
* Worlds made before this version will receive a bedrock layer at the bottom of the map and an ocean surrounding it.
== Bugs ==
; 1 bug reported
* The block being used to build does not show up unless it is a sapling.
== Trivia ==
* The video released by Notch on May 18th showing off 0.0.12a is actually a developer variant that was never released to the public. See Development for more information on this.
* To make the water and lava texture display slightly shorter than a block, it's texture from terrain.png gets shifted down a bit in-game. This causes the texture to overlap with the block below at some angles.
* The 0.0.13a-launcher jar contains the level generation files for this same version, which is also the same terrain generation files used in the full, public release of it (and 0.0.12a_01-03). It has variables that can enable and disable the uniform dirt layer, and it has been disabled for the public variant of 0.0.12a (or at least 0.0.12a_03 for certain). It also has variables for the water filling up the world from the corners, which can be disabled.
== Notes ==
== References ==
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