{{Infobox version
|title=Minecraft 12w18a
|image=Java Edition 12w18a.png
|edition=java
|type=Snapshot
|parent=1.3.1
|date=May 3, 2012
|clientdl=[https://vault.omniarchive.uk/archive/java/client-release/1.3/pre/12w18a.jar Client] ([https://archive.org/download/Minecraft-JSONs/12w18a.json .json])
|serverdl=[https://vault.omniarchive.uk/archive/java/server-release/1.3/pre/12w18a.jar Server]
|exedl=[https://vault.omniarchive.uk/archive/java/server-release/1.3/pre/12w18a.exe .exe]
[[Category:Versions using legacy download site]]
|prevparent=1.2.5
|prev=12w17a
|next=12w19a
|nextparent=1.3.2
}}<onlyinclude>

'''12w18a''' is the fourth [[snapshot]] for [[Java Edition 1.3.1]], released on May 3, 2012.<ref>{{cite|url=https://web.archive.org/web/20120505012639/http://www.mojang.com/2012/05/minecraft-snapshot-12w18a/|title=Minecraft Snapshot 12w18a|website=Mojang.com|date=May 3, 2012|author=[[Jens Bergensten]]}}</ref>

This snapshot is known for being the version to make singleplayer worlds run on a local server, resulting in the use of separate threads for rendering logic and world logic. This change resulted in a [[Java Edition 12w18a/List of broken features|large number of broken features]], several of which are yet to be fixed in the latest version, and on weak computers can result in server-lag in singleplayer.

== Additions ==
=== Blocks ===
; [[Log|Wood]], [[planks]], and [[stone bricks]]
* Now have their proper names (e.g. "Oak Wood", "Spruce Wood Planks", "Mossy Stone Bricks").

== Changes ==
=== Items ===
; [[Book and quill]]s
* Game no longer pauses when writing in a book and quill.

; [[Cocoa beans]]
* Now obtainable from jungle tree leaves.

; [[Sign]]s
* Game no longer pauses when writing in a sign.

; Wooden [[tool]]s
* Now can smelt one item in a furnace.

=== Mobs ===
; [[Villager]]s
* When spawned from [[spawn egg]]s, they now get a random profession.

=== Gameplay ===
; [[Breaking]]
* The 1⁄4 second (5 tick) delay between block breaking has been removed for players in [[Survival]]. The player can now [[Instant mining|instantly mine]] a large amount of blocks in Survival simply by holding {{control|destroy}} if conditions are met.

; [[Hardcore]]
* Hardcore is now available in [[multiplayer]].

; [[Singleplayer]]
* Separated server logic and client, therefore singleplayer is now a local server.

=== Command format ===
; General
* Game no longer pauses when entering a command or pausing the game.

=== General ===
; [[Debug screen]]
* Coordinates are now rounded to 5 digits.
* "ws", "fs" and "g" (Walking speed, flying speed and ground; "g" is ''true'' if the [[player]] is touching the ground).

; [[Language]]
* Updated language files.

; [[Splash]]es
* Splash "Mojang" screen now appears for 1 second instead of 3.

; [[Texture pack]]s
* Support and auto-download for server texture packs.

; Server jar
* The server jar now accepts [[Tutorials/Setting_up_a_server#Minecraft_options|command-line arguments]] <code>--demo</code>, <code>--port</code>, <code>--singleplayer</code>, <code>--universe</code>, and <code>--world</code>. The old <code>nogui</code> argument still works for backward compatibility.

== Removals ==
=== General ===
; Features broken by the internal server
{{main|Java Edition 12w18a/List of broken features}}
* Many features were broken or significantly changed due to the client-server split, many of which still remain absent from the game.

; [[Java Edition distance effects/Historical effects|Distance effects]]
* The particles from adding an [[eye of ender]] to an [[end portal frame]] block no longer appear offset if performed at high distances from the world origin.
** This is due to the fact that they simply did not appear at all from this snapshot onward, which is {{bug|MC-10369|another bug entirely}}.
** This bug resurfaced in [[Java Edition 19w14a]] when the aforementioned absent particles bug was fixed.

; Player
* The player "Notch" no longer drops an [[apple]] in addition to his inventory.

== Fixes ==
; 4 bugs fixed
* Fixed being unable to switch tools of the same kind in inventory.
* Fixed water destroying non-solid blocks when breaking them from above.
* Fixed picking a block in Creative with a tool in hand causing the tool to be lost.
* Fixed Silk Touch yielding only one slab from double slabs.</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:12w18a]]
[[es:Java Edition 12w18a]]
[[fr:Édition Java 12w18a]]
[[it:Java Edition 12w18a]]
[[ja:Java Edition 12w18a]]
[[ko:Java Edition 12w18a]]
[[nl:12w18a]]
[[pt:Edição Java 12w18a]]
[[ru:12w18a (Java Edition)]]
[[uk:12w18a (Java Edition)]]
[[zh:12w18a]]