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The Bowser statues that shoot lasers out of their mouths are referred to in the game code as "KoopaStatueVomit".
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subdirectory_arrow_right Super Mario Galaxy (Game)
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Twisty Trials Galaxy in World S has an area which is the exact same as an area in Super Mario Sunshine. The level "Spinning Spinning and Spinning," is the same as the trial area in "The Secret of Ricco Harbor".
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During development, characters such as Pikmin and Donkey Kong were planned to cameo in the game. However, Miyamoto didn't allow it, feeling that they wouldn't fit well within the game.
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The model for HellValleySkyTree makes an appearance in Grandmaster Galaxy, since the background from Shiverburn Galaxy was reused in this stage.
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The Boss Megahammer was at one point called Mallettoid, and was referred to as such in demos.
subdirectory_arrow_right Super Mario Galaxy (Game)
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Despite this, it was decided early on in the development of Super Mario Galaxy 2 to include Yoshi in the game, because his control scheme could act as a new main element of a new game and a "multiplication" of the elements from the previous game. The Wiimote controls for Yoshi were also formed early in development, with Shigeru Miyamoto taking pride in the tongue pulling mechanic used for eating fruit, fighting enemies and flipping switches, saying it "isn’t like anything you've ever experienced before." The rest of Yoshi's controls were shaped based on internal feedback from "everybody's love" for Yoshi, listing the development team, Mario Club Inc., and Nintendo of America as primary influencers for what the image of Yoshi should be, but tried to avoid making him too powerful. The developers also had composer Kazumi Totaka record new voice lines for Yoshi for the first time in ten years, and was reported as feeling "a little uneasy" and worried that Yoshi would sound like he had aged, but these were not concerns to them and the recordings were used in the game.
Iwata Asks interview:
http://www.nintendo.co.uk/Iwata-Asks/Iwata-Asks-Super-Mario-Galaxy-2/Volume-2-Koizumi-Motokura-Hayakawa-and-Hayashida/1-More-Super-Mario-Galaxy-/1-More-Super-Mario-Galaxy--237972.html
https://www.nintendo.com/en-gb/Iwata-Asks/Iwata-Asks-Super-Mario-Galaxy-2/Volume-2-Koizumi-Motokura-Hayakawa-and-Hayashida/2-That-s-Not-My-Yoshi-/2-That-s-Not-My-Yoshi--238028.html
http://www.nintendo.co.uk/Iwata-Asks/Iwata-Asks-Super-Mario-Galaxy-2/Volume-2-Koizumi-Motokura-Hayakawa-and-Hayashida/1-More-Super-Mario-Galaxy-/1-More-Super-Mario-Galaxy--237972.html
https://www.nintendo.com/en-gb/Iwata-Asks/Iwata-Asks-Super-Mario-Galaxy-2/Volume-2-Koizumi-Motokura-Hayakawa-and-Hayashida/2-That-s-Not-My-Yoshi-/2-That-s-Not-My-Yoshi--238028.html
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Yoshi can be found at Bowser's Galaxy Generator. If you successfully bring him to the end, he will wave goodbye to you as Mario goes up the flag.
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Super Mario Galaxy 2's internal disc ID is titled "Super Mario Galaxy More". This could suggest that Nintendo originally made the game as an expansion pack, rather than a true sequel.
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Super Mario Galaxy 2 was the most pirated Wii game for 2 years running (2010-2011) with over a million downloads each year.
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When asked how Yoshi could survive in space, producer Yoshiaki Koizumi stated, "Well, it's because he's a space Yoshi!"
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