First make sure you can use java from the command line.

Notch released version 4 today saying, "...instead of trying to squeeze in another real release, we're going to do weekly (or so) pre-releases".

We don't have full disclosure on the content of this pre-release yet, but one thing has been made clear, there aren't dragons in game just yet! Rename your OLD jar file "minecraft", and you will be able to play the old version again.

Please be patient if this does not work the first time.

The Magic Launcher is a new Minecraft launcher which can load mods dynamically without changing or patching the

No more mod installation problems, just select your mods and enjoy.

Extending Minecraft with pipes, auto-crafting, quarries, engines and much more!

Build Craft is a new game mod aiming at allowing users to build advanced structures and mechanisms. Pipes are used to transport items, fluids, and mechanical energy between inventories/machines.

There are many different types of pipes all with unique functions, including Wooden, Cobblestone, Stone, Sandstone, Iron, Gold, Diamond, Emerald and Obsidian.

Pipes can be combined with Pipe Sealant to allow them to make Fluid Pipes that can transport liquids or with Redstone to make Kinesis Pipes to allow them to transport mechanical energy.

If you want to run the server on any other OS or without GUI it’s a bit more involved.

If you run into memory issues, try launching it with java -Xmx1024M -Xms512M -cp net.minecraft. If you’re running on Windows and just want to set up a server easily, download Minecraft_and run it.