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 * Rosalina's Storybook was written by Yoshiaki Koizumi, director of Super Mario Galaxy. Koizumi mentioned that he would like Rosalina's story to be made into a children's book and that a Nintendo employee actually made a copy of the storybook for himself.
 * While Waluigi was created for Mario Tennis as a rival to Luigi, there were talks of a Princess Peach counterpart to further expand the roster. This proposed "Warupichi" (ワルピーチ) character was canceled by Shigeru Miyamoto.
 * Yoshi's Safari is the first and only dedicated shooting game that Mario has starred in.
 * In Super Mario Galaxy 2, Megahammer was originally going to be called Mallettoid, but its name was changed in the final version of the game.