From SmashWiki, the Super Smash Bros. wiki
Diamond City is a large city in the Wario universe, and is known for the gaming industry, the WarioWare, which is run by Wario and his friends. In the Warioware games you can travel to several locations in the city to play various microgames. These microgames fall into various categories based on the Warioware character representing them, such as 9-volt's microgames that are based on classic Nintendo games. In Super Smash Bros. Brawl, the stage WarioWare is set here.
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