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0.30 buildSeveral unreleased builds of post-Classic/pre-Indev showcased by Notch on his blog are labelled as 0.30; lasted from December 7, 2009 to December 22, 2009.
0.31The original title of Indev before it was decided on; lasted from December 23, 2009 to February 5, 2010.
Minecraft IndevWhat most people think of when they hear "Minecraft Indev"; lasted from February 6, 2010 to February 23, 2010.