Java Edition Alpha v1.2.0

Alpha 1.2.0, also known as the Halloween Update, added the Nether along with new Nether-exclusive mobs and blocks. It also added fishing, a new terrain generator and other changes and fixes.

Additions

 * New Realm: The Nether; a "Hell" world that can be used for quick travel
 * New blocks
 * Spawned in Nether: Netherrack, Soul Sand, and Glowstone
 * Pumpkin, Jack o'Lanterns
 * Portals
 * New mobs
 * Ghast
 * Zombie Pigman
 * New Item: Clock
 * New terrain generator, featuring biomes
 * Fishing rods serve a purpose by 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 3rd person mode, pressing  will create a view looking back at the player's own face.

Fixes
4 bugs fixed


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