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 * The Mario Kart 8 iteration of Bowser's Castle (pictured) is the only version in the series that does not feature any Thwomps.
 * In the Japanese version of the E3 2019: Nintendo Direct presentation, a written explanation for the "wrong Bowser" joke was added. As Bowser is known as 大魔王クッパ (King Koopa) in Japan, their audience would not have understood the joke with Doug Bowser's name.
 * Mario & Sonic at the Olympic Games Tokyo 2020 is the first Mario & Sonic game since Mario & Sonic at the London 2012 Olympic Games to be published by Sega, and the first Mario & Sonic game ever published by Sega in Japan and other East Asian countries.
 * In New Super Mario Bros. U, Mini Mushrooms have the ability to climb up walls.