Java Edition Classic 0.0.12a/Development – Minecraft Wiki

A couple of development versions of 0.0.12a were developed between May 17 and May 19, 2009. Server development started. Added basic code such as handling basic client connections and message sending. The version number is still "0.0.11a". There are no known gameplay differences between this version and 0.0.11a. This version is available in the launcher, mislabelled as "c0.0.11a". It was added to the launcher along with several other versions on August 6, 2013. Word of Notch post, video (

Java Edition version history – Minecraft Wiki

Java Edition Alpha v1.2.1 – Minecraft Wiki

Java Edition Classic 0.0.12a/Development – Minecraft Wiki

Java Edition Classic 0.28 – Minecraft Wiki

Java Edition Classic 0.0.19a_06 – Minecraft Wiki

Java Edition 1.20.2 – Minecraft Wiki

Java Edition Classic 0.0.11a – Minecraft Wiki

Java Edition Classic 0.0.12a_03 – Minecraft Wiki

Minecraft (partially found previous versions of sandbox game; 2009-present) - The Lost Media Wiki