It was awarded Game of the Year and Best Game on Wii by Guinness Book of World Records Gamer's Edition 2011. Super Mario Galaxy 2 is the 13th best-selling game for the Wii, with 6.36 million copies sold worldwide, as of March 31, 2014. Also, the world maps are based on the one from this game. 2  In both games, Bowser is giant, and the final battle is divided in two different parts, the latter having a bigger Bowser. 3  The model for the Koopalings' cake reappears in Super Mario Galaxy 2' s credits.