Java Edition Alpha v1.2.0

Alpha v1.2.0, the first release of the Halloween Update, was released on October 30, 2010, adding the Nether along with new Nether-exclusive mobs and blocks. It also added fishing, a new terrain generator, and other changes and fixes. This version is not available in the launcher; attempting to play it downloads Alpha v1.2.0_02 instead.

Additions

 * The Nether
 * A "Hell" world that can be used for quick travel
 * New blocks:
 * Netherrack, Soul Sand and Glowstone
 * Spawn in the nether.
 * Pumpkin, Jack o'Lanterns
 * Portals
 * New mobs:
 * Ghast
 * Zombie Pigman
 * New items:
 * Clock, Glowstone dust, Fish and Cooked Fish
 * New terrain generator, featuring biomes
 * Fishing
 * New music tracks

Changes

 * Higher lighting values are required the deeper they are to keep mobs from spawning.
 * Stairs, crafting tables, chests, and furnaces now face the same direction as the player when placed.
 * Creepers have new sounds.
 * Grass and leaves are now darker in shade.
 * Sunrise now creates a red glow at the horizon.
 * Pressing hides the HUD and the viewmodel from the person's view. In third person mode, pressing  will create a view looking back at the player's own face.

Fixes

 * 4 bugs fixed
 * Fixed bugs in multiplayer:
 * Redstone performance updated
 * Door animation fixes
 * Several performance bugs fixed
 * Rails no longer cause a crash