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.

Blocks

 * Leaves
 * Particle colors now reflect the biome instead of having the grayscale texture.

Mobs

 * Hostile mobs
 * Now only spawn at light level 7 or lower regardless of height, as they did before Alpha 1.2.0.

General

 * Music now plays on Multiplayer

Fixes

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

Trivia

 * This is the only Alpha v1.2 version that is currently lost.