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Asia is a continent on Earth. This real life setting makes a notable appearance in "7 Continents for 7 Koopas", from The Adventures of Super Mario Bros. 3. When Bowser tried to conquer the entire Real World, he put Bully Koopa under control of Asia. Bully vandalized the Great Wall of China by spraying graffiti all over it. Mario later stole Bully's wand, and turned the Wall into a giant dragon, who terrorized Bully.
In NES Open Tournament Golf, the country of Japan, is featured as a playable country. In Mario is Missing!, Luigi visits Japan's capital, Tokyo, and China|China's capital, Beijing. The events of Mario & Sonic at the Olympic Games, based on the 2008 Summer Olympics, take place in Beijing.