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Java Edition Classic 0.0.23a_01

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Classic 0.0.23a 01.png

Java Edition

Server version


Release date

July 12, 2009


Client (.json)

Protocol version


0.0.23a_01[1] [2] is a version of Classic released on July 12, 2009,[3][4] at 14:35 UTC.[5] It is the last version of Multiplayer Test. This version is not available in the launcher, but has been archived elsewhere.


  • Added a keymapping to control render distance.[6]
    • Players can once again press F to toggle render distance.[7]


To celebrate 10 years of Minecraft, a JavaScript remake of this version was uploaded to the Minecraft website, and made it possible to play multiplayer with up to 9 others through the browser. This version can be played at[8]


  • Notch planned to refactor the version naming system after this version, removing the second zero and the "a", becoming the format "<major version>.<release number>[_<patch number>]". As an example, since this was the most recent version at the time, "0.0.23a_01" would be called "0.23_01" with such a system.[3] However, this version was never actually given this name outside of this example.
    • This format was also used somewhat in Beta.



  • IRC logs on; #minecraft.20090711.log. July 11, 2009 (UTC−5).
  3. a b "Changing the version system"The Word of Notch, July 15, 2009
  4. "There are a lot of cool things like this on"The Word of Notch, July 12, 2009
  5. IRC logs: "A9:34:54 <08Notch> ok, _01 will be up in a minute or two" (14:34:54)
  6. IRC logs: "A9:32:05 <08Notch> moving it to an F-key, though [...] well, I could just make it mappable.." (14:32:05 UTC)
  7. IRC logs: "A9:39:26 <CheeToS> yay, thank you for putting the f key back" (14:39:26 UTC)
  8. "Embrace the Past with Minecraft Classic" by Tom Stone., May 7, 2019