Diamond City

Diamond City is a city in the WarioWare series. Wario claims that it is "his city" that he has made into a "sparkling gem of a metropolis." Here, Wario and his friends develop microgames for WarioWare, Inc., and most of them reside here.

Location
It is not clearly known where Diamond City is located. The WarioWare series suggests that the city is possibly located on Earth (mostly from various statements made by Orbulon). A map of Earth that can be seen in Wario's House seems to support this assumption. Earth is also seen in the opening cutscene of WarioWare Gold, significantly resembling the real world Earth as opposed to the Earth seen in main series Mario games such as Super Mario Odyssey. In the opening cutscene of WarioWare: Get It Together!, structures from and  in California are used. Additionally, descriptions for Orbulon's microgames mentions Asia and Japan. However, the Diamond City race course in Mario Kart Arcade GP features symbols such as E. Gadd's logo and Magic Paintbrushes, suggesting that Diamond City and the lands from that of the main series Mario games are all on Earth.

In WarioWare: Twisted!, it can be seen that Diamond City is located on an island.

Areas

 * 9-Volt's House
 * Agate Forest
 * Ashley's Mansion
 * Club Joe
 * Club Spice
 * Club Sugar
 * Crystal Park
 * Diamond Academy
 * Diamond Broadcasting System
 * Diamond City Amusement Park
 * Diamond City Castle (referred as "Castle" in WarioWare, Inc.: Mega Microgame$! and "Diamond Dojo" in WarioWare: Smooth Moves)
 * Diamond City Elementary
 * Diamond City Kindergarten
 * Diamond City Times
 * Diamond City Stadium
 * Diamond Knoll
 * Diamond Taxi
 * Dr. Crygor's Lab
 * Dr. Payne's Dental Clinic
 * Emerald Street
 * Gigantaburger
 * Gelateria
 * Hawt House
 * Joe's Clothes
 * Kat & Ana's House
 * Mona Pizza
 * Penny's Lab
 * Peridot Campgrounds
 * Pizza Dinosaur
 * Restaurant Sora Sora
 * Sapphire Street
 * Temple of Form
 * The Sweet Spot
 * Tomorrow Hill
 * Toy Express
 * Wario's House
 * WarioWare, Inc.

Mario Kart series
In Mario Kart Arcade GP and Mario Kart Arcade GP 2, Diamond City makes an appearance as a race course.