Diamond Software is an entertainment company introduced in WarioWare: D.I.Y.. The company publishes microgames, comics (under the name Diamond Publishing) and records (under the name Diamond Studios). Prior to WarioWare: D.I.Y., Mona, Jimmy T., Ashley, Orbulon and 9-Volt left WarioWare, Inc. to work for Diamond Software. In the D.I.Y. Forum feature, they talk about this:
Also according to the D.I.Y. Forum, Manager Joe runs the company. Although not explicitly stated, Game & Wario implies the departed employees have returned to work for WarioWare Inc. at some point of time.
Diamond Software's microgame sets/records/comics have their own category in the D.I.Y. Shop portion of the game and encapsulate most of the premade content of WarioWare: D.I.Y. The character sets and comics are unlocked based on the ingame clock, while records are unlocked by completing achievements.
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