Most Indev versions say 0.31 in the corner, although, this is an error, and is not actually 0.31, but is Minecraft Indev.
This version is not available to play in the Minecraft launcher as of writing this article. This prototype, like the many other versions of the Indev (Indev meaning In development) development phase of Minecraft, was available to play on in 2010.
The Januprototype build of Minecraft, from its Indev phase of development.
Finding the URLs for the game files in the code of the website and going to them.
