only the offical one wich reads :

Daniel Frisk has provided the following instructions on how to get started.

Minecraft – Pi Edition runs on Raspbian “wheezy” with XWindows. If you need to set that up, visit http://www.raspberrypi.org/downloads and follow the detailed instructions within.
Boot up your Raspberry Pi with Raspbian. If you haven’t set XWindows to start automatically upon boot, type in “startx”.
Next click the icon for LXTerminal to open a new terminal window. Use the following commands (in bold) to download and launch:

To download it: click here or visit https://s3.amazonaws.com/assets.minecraft.net/pi/minecraft-pi-0.1.1.tar.gz
To decompress it: tar -zxvf minecraft-pi-0.1.1.tar.gz
To run it: cd mcpi
Followed by minecraft-pi