Development

Super Mario Galaxy 2 was revealed at Electronic Entertainment Expo 2009. Mario creator Shigeru Miyamoto stated that the development team had originally planned just to do variations on the original game's planets, but over time thought of all-new ideas. The game is said to have 95–99% new features, with the rest being previous features introduced in Super Mario Galaxy. In Miyamoto's private conference, it was stated at the time that the game is very far along in development, but its release was held back to mid-2010, due to New Super Mario Bros. Wii's release in late 2009.[19] In regards to the original game, Nintendo of America President and CEO Reggie Fils-Aime stated in an interview that the sequel would be more challenging,[20] and Miyamoto said in a Wired interview that the game would have less focus on plot.[21] Development for the game has been finalized,[22] and the game's soundtrack, which, like that of the original game, is composed for a symphony orchestra, has been recorded.[23]
Miyamoto initially hinted that the game might utilize the "Super Guide" feature, introduced in New Super Mario Bros. Wii, into the game,[24] and was confirmed by Nintendo's Senior Manager of Product Managing, Bill Trinen, who claimed that the feature is implemented differently compared to what New Super Mario Bros. Wii offered.[25] The game made its playable debut at the Nintendo Summit 2010 on February 24, 2010, when a second trailer for the game was released, and its North American release date on May 23, 2010 was finally announced