{{Infobox version
|title=Minecraft 12w21a
|image=12w21a Banner.png
|image2=Java Edition 12w21a.png
|edition=java
|type=Snapshot
|parent=1.3.1
|date=May 24, 2012
|clientdl=[https://vault.omniarchive.uk/archive/java/client-release/1.3/pre/12w21a.jar Client] ([https://archive.org/download/Minecraft-JSONs/12w21a.json .json])
|serverdl=[https://vault.omniarchive.uk/archive/java/server-release/1.3/pre/12w21a.jar Server]
|exedl=[https://vault.omniarchive.uk/archive/java/server-release/1.3/pre/12w21a.exe .exe]
[[Category:Versions using legacy download site]]
|prevparent=1.2.5
|prev=12w19a
|next=12w21b
|nextparent=1.3.2
}}<onlyinclude>

'''12w21a''' is the sixth [[snapshot]] for [[Java Edition 1.3.1]], released on May 24, 2012.<ref>{{cite|url=https://web.archive.org/web/20120525103351/https://www.mojang.com/2012/05/minecraft-snapshot-week-21/|title=Minecraft Snapshot Week 21|website=mojang.com}}</ref>

== Additions ==
=== Blocks ===
; [[File:Emerald Ore JE1.png|32px]] [[Emerald ore]]
* Drops 1 [[emerald]] when mined.
* Generates in blobs of up to 10 blocks.

; [[File:Ender Chest JE1 BE1.png|32px]] [[Ender chest]]
* Crafted with 8 [[obsidian]] and 1 [[eye of ender]].
* All ender chests in a [[world]] have the same contents, if those contents change it affects the contents of all other ender chests.
* On [[multiplayer]], the ender chest's contents are the same for all players on a server.

; [[File:Sandstone Stairs JE1.png|32px]] [[Sandstone stairs]]
* Have the same function and recipe as other [[stairs]], but made of [[sandstone]].

=== Items ===
; [[File:Emerald JE1 BE1.png|32px]] [[Emerald]]
* Dropped when mining an [[emerald ore]] block.
* Used in villager [[trading]].

; [[File:Enchanted Golden Apple JE1 BE1.gif|35px]] [[Enchanted golden apple]]
* A second type of golden apple made with [[blocks of gold]].
* After being consumed, the player receives 30 seconds of Regeneration IV, plus Resistance and Fire Resistance for 5 minutes.

=== World generation ===
; [[Desert temple]]s
* New generated structure in desert biomes that resemble pyramids.
* Have a [[TNT]] trap and loot chests inside.

; Desert [[village]]s
* Villages that generate in desert biomes now are made of sandstone rather than wood and cobblestone.

=== Gameplay ===
; [[Trading]]
* Villagers buy or sell the player [[emerald]]s in exchange for certain items.
* Trade with villagers by right-clicking on them, opening up a GUI with one buying slot and one selling slot.

=== Command format ===
; [[Command]]s
* {{cmd|seed}}
** Displays the current world seed.

== Changes ==
=== Blocks ===
; [[Dispenser]]s
* Eject [[water]] and [[lava]] source blocks from buckets.
* Also take water and lava source blocks if there is an empty bucket inside.

; [[Gravel]]
* Changed texture.

; [[Locked chest]]
* Removed old [[chest]] texture, causing locked chests to appear as the purple default block.

=== Items ===
; [[Bucket]]s
* Now stackable to 16.

=== Mobs ===
; [[Passive mobs]]
* Can be easily pushed around by simply walking, most likely intended to help the player navigate through animal farms more easily.

=== Non-mob entities ===
; [[Boat]]s
* Now pass through [[lily pad]]s without breaking the boat; the lily pad drops as an item instead.

; [[Minecart]]s
* While sitting inside of a minecart, pushing the directional keys makes it move the direction player is pressing. This only works while the minecart is sitting on rails.

=== Gameplay ===
; [[Creative]]
* Added [[snow]] to the Creative inventory.

; [[Singleplayer]]
* Removed Server Jar dependency in singleplayer.

; [[Sky]]
* [[Stars]] are more realistic.
** They are now slightly smaller and slightly brighter.

=== General ===
; [[Options]]
* Improved options menu.

; [[Debug screen]]
* The F3 menu no longer has the frame time graph.</onlyinclude>

== Trivia ==
* In this version, when loading a singleplayer world, one needs to put <code>minecraft.zip/server/minecraft_server.jar</code> into <code>.minecraft/server</code> manually to continue loading.

== References ==
{{Reflist}}

== Navigation ==
{{Navbox Java Edition versions|1.0}}

[[de:12w21a]]
[[es:Java Edition 12w21a]]
[[fr:Édition Java 12w21a]]
[[it:Java Edition 12w21a]]
[[ja:Java Edition 12w21a]]
[[ko:Java Edition 12w21a]]
[[nl:12w21a]]
[[pt:Edição Java 12w21a]]
[[ru:12w21a (Java Edition)]]
[[th:รุ่น Java 12w21a]]
[[uk:12w21a (Java Edition)]]
[[zh:12w21a]]