In this version and Alpha 1.2.6, if the player's name is not set properly (which occurs in the modern launcher), they will always be named "Player524". This makes multiplayer in this version impossible without the use of third-party tools, as two players cannot join a server with the same name.
Gallery[]
An Alpha v1.2.5 world.
The Minecraft Webpage with this version.
Notes[]
↑The .jar file is dated to 15:08 UTC on December 1.