Super Mario Galaxy 2​ is a platforming video game developed by Nintendo for the Wii. Was first announced at E3 2009 and is a sequel to Super Mario Galaxy. He was released in North America on May 23, 2010, in Japan on May 27, 2010, in Europe on June 11, 2010, and in Australia on July 1, 2010. The levels of the game galaxies filled with small planets and worlds. While gameplay is based on that of ... more.