You are to generate question and answer pairs based on the following information:
Alpha
Main article: Java Edition Alpha
OldNether
The Nether in Alpha

Alpha was released on June 30, 2010, however, only technically, as the first version labeled as Alpha was Alpha v1.0.1. When this update was released, NAME_1 decided to rename Infdev (June 30, 2010) to Alpha v1.0.0. This phase of the game saw many major features added to Minecraft. Multiplayer for Survival was created, and features such as redstone circuits, boats, new music and new mobs, often without announcement in "Seecret Friday Updates".

The Halloween Update on October 30, 2010, was a major update adding biomes, The Nether, new mobs, blocks and items, and other changes.

One could see Alpha's introduction of biomes as being the return, at least in part, of Indev's world themes, and indeed the Nether is not unlike the 'Hell' world theme. Another reintroduction in Alpha was the return of multiplayer. Unlike Classic's Creative multiplayer, Alpha's multiplayer was available only in Survival form that is logically called "Survival Multiplayer".

It is still playable on the launcher by enabling the "Historical versions" button in the Launch options. Today, 23% of all Alpha versions are lost.

Beta
Main article: Java Edition Beta
Beta
Beta

Beta was the sixth and last phase of Minecraft's development before its official release. Beta was released on December 20, 2010. Features that were added include a new logo and launcher, customizable world name and world seed, achievements and statistics, weather, Smooth Lighting, dyes, more plant types (two new types of trees and tall grass), wolves and squid, beds, and other blocks and items.

The Adventure Update was a major set of updates, focusing on exploring and combat and adding an ending to the game. Features added include a new terrain generator, new mobs, blocks, biomes, and items. Three generated structures were added: villages, strongholds, and mineshafts. Changes to general gameplay include an improved combat system including critical hits and experience, a reintroduced Creative, Hardcore, and a way to finish the game by traveling to The End and defeating the ender dragon.

Originally planned to be started in Beta 1.7, the first part of the Adventure Update was released as Beta 1.8 on September 14, 2011. Starting on September 9, 2011, developmental versions were "leaked" by NAME_2.[28] Beta 1.9 was never released, but 6 pre-releases using the 1.9 version number were made available for users to test and repor