Several unreleased development versions of the game labelled '''0.0.13a''' were developed on May 21st. They show in-development features later included in [[0.0.13a]] and later releases. The huge world size features showcased in these versions would not be publicly available until [[0.0.14a]].

== World size test (1) (May 21, 2009) ==
{{Unreleased version|available=1|section=1}}
{{Infobox version
|title=0.0.13a
|image=Classic 0.0.13a-dev.png
|edition=Java
|unreleased=1
|date=May 21, 2009
|jsonhash=7677a2d81caba8719dc797851828032ddf45d622
|jsonfile=c0.0.13a
|clienthash=936d575b1ab1a04a341ad43d76e441e88d2cd987
|phase=Classic
|no_data=1
|no_protocol=1
}}

* '''Additions'''
** Added a thin black block selection outline.
** Pressing Esc now opens the pause menu, with options to return to game, generate a new level and save/load level, the last of which doesn't do anything. 
* '''Changes'''
** Changed the game's resolution from 640×480 to 854×480.
** The block being used is once again shown in the top right corner.
** Made swimming and sinking faster than before. 
** Holding the {{ctrl|jump}} key no longer allows for autojumping.
** Jump height reduced back to just over 1 block instead of just over 1.5 blocks.
** This is the earliest version in the launcher where holding down <kbd>R</kbd> no longer causes the player to cycle between different locations - holding the key now has the same effect as simply pressing it.
** Lava is no longer transparent and has a thick, red mist when underneath it.
** Changed the texture of saplings from [[File:Oak Sapling JE1.png|32px]] to [[File:Oak Sapling JE2.png|32px]]
** The generated world is now completely flat. When generating a new level from the pause menu, the world is of a long shape (32×64×512), but still flat. It is worth noting that caves can still generate in these worlds.
* '''Trivia'''
** This is the version available in the launcher, added to it among several other versions on August 6, 2013.
** This is the only 0.0.13a developer build that is available in the launcher.

=== Gallery ===
<gallery>
Classic 0.0.13a.png|A screenshot of world size test 1.
Classic 0.0.13a-dev1 long world.png|A long flat strip of grass block.
Dinnerbone 0.0.13a.png|Screenshot of this version from [[Dinnerbone]].
</gallery>

== World size test (2) (May 21, 2009) ==
{{Unreleased version|section=1}}
* '''Changes'''
** The world is now 1024×64×64 instead of 512×64×32 in size, and generates actual terrain.
** Terrain has been updated to the 0.0.13a_03 format.
** Dirt layer is now more uniform.
*** There is always a single block of dirt after grass and before stone.
** If water generates next to lava on world generation, it now produces stone.
* '''Reference'''
** Minecraft IRC logs, May 21, 2009
*** "(10:48:56) Notch_: and I just tried making a 1024x64x64 map. It's nuts [...] (10:49:06) Notch_: it's basically a looong gauntlet of hills and lakes"
* '''Trivia'''
** It is very likely this version has the new level generation screen, however this is not confirmed. 

== Huge levels (May 21, 2009) ==
{{Unreleased version|section=1}}
'''[https://www.youtube.com/watch?v=66NmCgKhZ_A YouTube video (reupload)]'''
* '''Changes'''
** The world size is now 512×64×512.
** Surface lava lakes are still possible, as seen in the video.
** The world generation screen has been changed.
*** The dirt background is now darker.
*** Added a progress bar below the progress text.

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

[[Category:Unreleased builds]]
[[Category:Development version lists]]

[[es:Java Edition Classic 0.0.13a/Desarrollo]]
[[fr:Édition Java Classique 0.0.13a/Développement]]
[[hu:Java Edition Classic 0.0.13a/Fejlesztés]]
[[ja:Java Edition Classic 0.0.13a/開発版]]
[[pt:Edição Java Classic 0.0.13a/Desenvolvimento]]
[[ru:Classic 0.0.13a (Java Edition)/Разработка]]
[[zh:Java版Classic 0.0.13a/开发]]