Java Edition Alpha v1.2.1

Alpha v1.2.1 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.

Changes

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

Fixes

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