Java Edition Alpha v1.2.1

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Minecraft Alpha v1.2.1

Java Edition

Server version


Release date

November 5, 2010


Client not archived
See Alpha server 0.2.3

Protocol version


Other editions of 1.2.1
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Alpha v1.2.1[1] was a version of Alpha released on November 5, 2010, to fix bugs. Although the launcher claims to have this version available, the version listed is just a duplicate of Alpha v1.2.1_01.[2]


  • Mob spawning reverted to old code.
  • Leaves particle colors now reflect the biome instead of having the grayscale texture.


  • Signs on the sides of cacti no longer crash the game.
  • Optimized CPU usage for mob spawning.
  • Music now plays in multiplayer.


  1. "Minecraft Alpha 1.2.1, Minecraft Server 0.2.3" – The Word of Notch, November 5, 2010.
  2. MCL-9282