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Minecraft 12w21b

Java Edition



Release date

May 25, 2012

Snapshot for



Client (reupload)
Server (.exe)

Protocol version


Missing Texture Block.png
The pre-reupload version of this version is currently missing.
This version has been reuploaded at one point in time. While the reuploaded version has been archived, the pre-reupload has not, and as such is it currently lost.
If you believe you have a copy of this version, please post on this page's talk page.

12w21b[1] is the seventh snapshot for Java Edition 1.3.1, and was released to fix some of the bugs and crashes in the 12w21a snapshot.



Emerald ore
  • Texture changed from Ruby Ore.png to Emerald Ore.png.
Locked Chest
  • Locked Chest's texture changed with an addition emerald texture.


Chainmail armor
  • Now available in survival mode via trading.


  • Saving and loading chunks is slightly faster.
  • New inventory screen in Creative
    • Blocks and items are sorted by category, each category in its own tab, the categories are: Building Blocks, Decoration Blocks, Redstone, Transportation, Miscellaneous, Foodstuffs, Tools, Combat, Brewing, and Materials.
    • The inventory can be searched for specific items: just start typing while in the inventory screen. The search results will be displayed in the Search Items tab.
    • The player's survival mode inventory is accessible via a tab with the chest as its icon.
    • Brewed potions will not be included in their own category.
    • To close the new inventory window you must press 'Esc'. Using the default inventory key does not currently work.
    • Added monster egg to Creative inventory.


F3 Debug screen
  • The F3 menu no longer has the graphs.


12w21b was reuploaded later on May 25, 2012 to fix translation griefings.[2]