{{Lost version|pre-reupload}}
{{Infobox version
|title=0.0.21a
|image=Classic 0.0.21a.png
|edition=java
|prefix=Classic
|date=June 22, 2009
|clientdl='''Original:''' Client not archived<br>
'''Reupload:''' [https://archive.org/download/Minecraft-JE-Classic/c0.0.21a/c0.0.21a.jar Client] ([https://archive.org/download/Minecraft-JE-Classic/c0.0.21a/c0.0.21a.json .json])
|server=[[Classic server 1.8.2|1.8.2]]
|prev= 0.0.20a_02
|prevparent= 0.0.20a
|next= 0.0.21a_01
|nextparent= 0.0.22a
}}

'''0.0.21a'''<ref name="release"/><ref name="yt">{{ytl|iMJDvkHgnxU|minecrafting|Lil fimbul|June 23, 2009}}</ref> is a version of [[Java Edition Classic]] released on June 22, 2009,<ref name="blog">[[wordofnotch:128292167|"New client, fixes a few annoyances"]] – The Word of Notch, June 22, 2009</ref> at 19:52 UTC.<ref name="release">[[#logs|IRC logs]]: "''P2:52:16 <Notch> 0.0.21a is up, fixing the long standing picking bug''" (19:52:16 UTC)</ref> This version is not available in the launcher, but its reupload has been archived elsewhere.

0.0.21a was reuploaded<ref>[[#logs|IRC logs]]: "''P3:12:15 <peerkoel> hm, client version is still 0.0.21a?''" (20:12:15 UTC)</ref> at 20:09 UTC (17 minutes after release) to re-add the ability to auto-click.<ref name="reupload">[[#logs|IRC logs]]: "''P3:09:13 <Notch> client is updated again''" [...] "''P3:10:20 <Notch> does autoclick work now?''" (20:09:13 to 20:10:20 UTC)</ref>

== Changes ==
[[File:Blocks0021a.png|thumb|All of the blocks in this version.]]
; [[Inventory]]
* Now has a gray background.<ref name="yt"/>
* It is now possible to walk and change slots while in the inventory.<ref>[[#logs|IRC logs]]: "''P2:52:22 <Notch> also, new B-menu''", "''P2:52:28 <Notch> you can walk and change slot with it up now''" (19:52 UTC)</ref>

; World generation[[File:Generation in 0.0.21a.jpg|thumb|179x179px|The generation in this version.]]
* "Carving" section of world generation has been changed slightly, causing the world to take longer to generate.<ref>[[#logs|IRC logs]]: "''P2:54:48 <greenslimy> Notch, Im on single player and generating a map is so slow >.>''" [...] "''P2:57:04 <Notch> carving changed a bit''" (19:54:48 & 19:57:04 UTC)</ref>

; Performance
* Higher FPS on some computers.<ref name="blog"/>

== Fixes ==
; 3 bugs fixed
* Fixed a bug that caused the game to be impossible to play on MacBook.<ref name="blog"/>
* <!-- [[Controls#Configurable controls|Picking]] should work everywhere. -->Fixed a bug with OpenGL picking.<ref name="release"/><ref>[[#logs|IRC logs]]: "''P2:58:28 <peerkoel> Notch: what exactly was the picking bug?''" [...] P2:58:40 <Notch> opengl picking wasn't working right on some cards''" (19:58 UTC)</ref>
** Changed to using raycasting.<ref>[[#logs|IRC logs]]: "''P2:58:54 <Notch> so I changed it to a pure software implementation (raycasting)''", "''P2:58:57 <Notch> it's also ten times faster, heh''" (19:58 UTC)</ref>
* Fixed a problem with not being able to highlight blocks.<ref>[[#logs|IRC logs]]: ''P4:05:10 <Haruhi2> I fixed the problem''" [...] "''P4:05:17 <Haruhi2> with not being able to highlight''" [...] "''P4:05:41 <Notch> actually, 0.0.21a fixes it at well''" [...] "''P4:05:51 <Notch> all highlighting is done is software now. =)''" (21:05 UTC)</ref>

== Bugs ==
* Pre-reupload: mouse auto-clicking no longer works.<ref>[[#logs|IRC logs]]: "''P3:00:13 <PuyoDead> no auto click is killing me already''" (20:00:13 UTC)</ref>

== Reupload ==
The following lists the changes in the reupload of 0.0.21a.

=== Changes ===
* Auto-clicking now works again.<ref name="reupload"/>
* Reach was increased by a little more than 2 blocks.<ref>[[#logs|IRC logs]]: "''P3:12:45 <AlLnAtuRalX> Notch, thanks for increasing build distance''" (20:12:45 UTC)</ref>
* If a plant is in the shade, then selected, its sprite will vanish.<ref>[[#logs|IRC logs]]: "''P3:13:23 <vdgmprgrmr> I noticed that, if any plant is in the shade, and you move your cursor over it while in delete mode, a transparent white box will appear like normal, but the actual plant sprites will vanish.''" (20:12:23 UTC)</ref>

=== Bugs ===
* Introduced a hang bug, causing the game to freeze randomly, requiring a relaunch to resolve.<ref>[[#logs|IRC logs]]: "''P3:53:52 <flak> minecraft keeps randomly hanging my furryfaux''", "''P3:53:56 <Maulrus> same''", "''P3:54:05 <vdgmprgrmr> Same as flak.''" [...] "''P3:54:20 <Maulrus> minecraft crashes it and I have to close the tab quickly when I restart it or it'll freeze it again''", "''P3:54:23 <Maulrus> but not often''", "''P3:54:24 <vdgmprgrmr> But it happens pretty rarely...''" [...] "''P3:55:15 <ZomBuster> it randomly freezes''" (20:53:52 to 20:55:15 UTC)</ref>

== Gallery ==
<gallery mode="">
Classic 0.0.21a screenshot1.png|Sonic pixel art.
Classic 0.0.21a screenshot2.png
21apyramid inside.jpg
21acastle.jpg
21askybridge.jpg
</gallery>

== References ==
* {{anchor|logs}}[https://archive.org/download/Minecraft_IRC_Logs_2009/DBN-IRC-Logs/ IRC logs] on Archive.org; #minecraft.20090622.log. June 22, 2009 (UTC&minus;5).
{{reflist}}

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

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