Super Mario Galaxy 2

Super Mario Galaxy 2 is a 2010  platform   video game  developed and published by  Nintendo  for the  Wii . It was first announced at  E3 2009  and is the sequel to 2007's  Super Mario Galaxy . It was released worldwide in 2010. Much like the first game, the story follows  Mario  as he pursues the Koopa King,  Bowser , into  outer space , where he has imprisoned  Princess Peach  and taken control of the  universe  using Power Stars and Grand Stars. Mario must travel across various  galaxies  to recover the Power Stars in order to travel to the center of the universe and rescue Princess Peach. The game was originally planned as an updated version of  Super Mario Galaxy , known as  Super Mario Galaxy More . However, it was later decided that the game would be expanded into a fully fleshed-out sequel when the development staff continued to build upon the game with dozens of new ideas. As such, development time expanded to two and a half years. Among the new additions are dynamic environments, new  power-ups , and the addition of  Yoshi . Upon release,  Super Mario Galaxy 2  was met with critical acclaim, and was considered an improvement over its already-lauded predecessor, with its creativity, level design, gameplay, music, and technological improvements over the original receiving high praise, although its high difficulty and watered-down story, in comparison to its predecessor, received some criticism. It is frequently considered by critics and fans to be one of the  greatest video games of all time  and is one of the  best-selling games on the Wii , with over seven million copies sold worldwide.