Minecraft has been around for a long time. It was officially released back in November 2011, but has been around for a lot longer in the way of Alpha and Beta versions of the game. Sometimes its great to go back and play these versions, and with the help of the new launcher available in Minecraft 1.6 we now can. The video shows below exactly how its done.
If you do not have the new launcher, you can grab it from Minecraft.net