Java Edition Alpha v1.2.0

Alpha v1.2.0, the first release of the Halloween Update, is the first version of Alpha v1.2. It 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.
 * Netherrack Revision 1.png Netherrack
 * Soul Sand.png Soul Sand
 * Glowstone Revision 1.png Glowstone
 * Spawn in the nether.
 * Carved Pumpkin.png Pumpkin
 * Jack o'Lantern.png Jack o'Lantern
 * Portals
 * New mobs:
 * Ghast
 * Zombie Pigman
 * New items:
 * Clock, Glowstone dust, raw cod, and cooked cod (called raw fish and cooked fish at the time, respectively)
 * 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.

Removed

 * Removed Winter Mode

Fixes

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