During the Alpha phase, Minecraft was updated very frequently, as Notch and Jakob Porser had moved into a new space and were working full-time on Minecraft. Bug fixes and tweaks could happen throughout the week, appearing on the game's development blog, with major additions and changes appearing in Seecret Updates, leaving the game's players to discover the included new features.
- Main article: Java Edition Version History
- Survival Multiplayer Mode (SMP). At the time, the only way to connect to a server was to find out the IP of it.
- The Nether – A realm accessible with portals that contain blocks and mobs (i.e. Ghasts and Zombie Pigmen as of yet) not found in the normal world, and allows for fast travel.
- Biomes – Different environments that differ as location/chunk/temperature changes.
- The addition of Redstone Circuits, a boolean-based system.
- The following items from the Halloween Update: Netherrack, Glowstone, Soul Sand, Pumpkin, and the Jack o' Lantern.
- Improved AI pathfinding and spawning.
- New sounds for caves and mobs.
- The addition of Snowy and Icy terrain, plus craftable snow blocks.
- The addition of boats.
- Cow, slime, and chicken mobs.
- New music.
- More paintings.
- Current Height: 128 blocks from bottom to top.
- Pressing removed the inventory display and the player's arm (the HUD, or Heads Up Display).
- Holding down and pressing would take a screenshot. The images were saved in .minecraft\screenshots.
- Difficulty toggle.
- Pressing in Alpha sometimes crashed the game.
- Minecraft Alpha 1.0.16_02 is when the Herobrine rumors apparently started.
- The first-ever multiplayer image was taken in Alpha 1.0.10 when Notch and 3 other players were testing SMP.
- There was one debug feature in Alpha 1.2.2 where pressing Nether Portals to spawn. would cause
- Notch's "Test Server" was released in Minecraft Alpha 1.0.12 when players were testing SMP.
- In Alpha 1.0.0, if a player were to play on a world and look at the top left, it would say "Minecraft Infdev" instead of "Minecraft Alpha 1.0.0".
- The price for Minecraft Alpha was €9.95 (£8.95/$11.54).
- On September 18, 2010, the Minecraft authentication server broke. Notch turned this into a free weekend where everyone could download and play the game. This got the game lots of free press coverage and lots of players bought the game afterward.
- In Alpha 1.2.6, and some beta releases the player could make Triple Chests, and even Quadruple Chests using a glitch showcased here
- https://notch.tumblr.com/post/1599383480/wait-its-wednesday - Notch on Tumblr
- https://notch.tumblr.com/post/2175441966/minecraft-beta-december-20-2010 - Notch on Tumblr
- https://notch.tumblr.com/post/1145356099/free-minecraft-until-this-gets-fixed - Notch on Tumblr