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. Among the new additions are dynamic environments, new power-ups, and the addition of Yoshi. As such, development time expanded to two and a half years. 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. The game was originally planned as an updated version of Super Mario Galaxy, known as Super Mario Galaxy More. 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. 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. It was first announced at E3 2009 and is the sequel to 2007's Super Mario Galaxy. Super Mario Galaxy 2 is a 2010 platform video game developed and published by Nintendo for the Wii.

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