Unstack 2 is a simple, yet gripping block removal
game. The concept that out as a twist on the game mechanics of Tetris
but since has grown in its own right. It was release into the Google
Play store in April 2013. Unstack 2 is a highly improved version of a 2011 game. Where the
original used MacRuby, the new version comes in Lua using the CoronaSDK.