Java Edition Classic 0.0.23a_01

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Classic 0.0.23a 01.png

Java Edition

Server version


Release date

July 11–12, 2009


Client (.json)

Protocol version


0.0.23a_01 is a version of Classic released between July 11 and 12, 2009.[1] It is the last version of Multiplayer Test. This version is not available in the launcher, but has been archived elsewhere.


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[2]


  • Notch planned to refactor the version naming system after this version, removing the second zero and the "a". 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.[1] However, this version was never actually given this name outside of this example.
    • Would follow the format "<major version>.<release number>[_<patch number>]".
      • This format was also used somewhat in Beta.



  1. a b Changing the version systemThe Word of Notch, July 15, 2009
  2. "Embrace the Past with Minecraft Classic" –, May 7, 2019