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 * Despite being Wario's partner, Waluigi (pictured) has never made an appearance in the Wario series.
 * Mario Strikers Charged and Mario & Luigi: Dream Team are the only Mario games to receive an E10 rating by the ESRB.
 * In the Japanese version of Paper Mario: The Thousand-Year Door, Peeka wears bunny ears, cuffs, and a bow, a reference to the Playboy Bunny suit. In the European and American versions, Peeka instead wears cat ears like her sister, Lahla.
 * The Italian names of Private Goomp, Corporal Paraplonk, and Sergeant Guy reference the Italian terminology "Tizio, Caio and Sempronio," meaning "three random guys".